In Css, rem stands for "root em". It is a unit of measurement used to define sizes relative to the font size set on the root element of the document. In other words, it is a font size relative to the root element of the document. For example, if an element has a font size of 16px and is set to rem, the font size is set to 1rem, or 16px. rem can also be used to set the size for other elements and makes it easier to manage elements across different devices and screen sizes. For example, if you set the font size of the root element to 16px, 1.2rem will be equivalent to 19.2px, regardless of the device or screen size. More information on rem can be found here.

position: fixed; in CSS is a positioning that is relative to the viewport/browser window. That is, it's always fixed to the top, left, right and/or bottom of the browser window, regardless of the position of any scroll bar.

position: relative; in CSS is relative to its original position. That is, it's relative to its normal position, even if it's been scrolled horizontally or vertically, it will be relative to its original position.

CSS gradients provide an easy way to add smooth transitions between two or more colors in your HTML elements. To create a gradient using CSS, you'll need to use the linear-gradient or radial-gradient functions in your stylesheet, then use a combination of color-stops and directions to create the effect you're looking for.

For example, to create a linear background gradient with multiple colors, the code might look like this:

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background-image: linear-gradient(45deg, blue, green, yellow, red);

For further information and examples, see the MDN documentation on CSS gradients.

You might need to add some margin or padding to your footer to account for this. For example, you can find the footer element in your HTML and add padding-bottom in your CSS file like this:

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footer {
  padding-bottom: 10px;
}

If you are also adding media queries, you may also need to adjust the margin or padding in the media query so that it is consistent across all devices:

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@media (max-width: 390px) {
  footer {
    padding-bottom: 10px;
  }
}

That should be enough to account for the gap at the bottom of the footer. Read more about media queries. Good luck!

From the given information it is difficult to diagnose what the exact cause of the line gap is. Generally speaking, styling an HTML footer involves setting styles for the footer element and its children, then resetting the default browser margins and padding accordingly to achieve a desired layout.

For example, if you wanted a footer to extend across the entire bottom of a page:

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footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 30px;
}

body {
  margin: 0;
  padding: 0; /*add this line as a part of your solution*/
}

Reference: CSS-Tricks - Footers

In order to get rid of the tiny gap on the right hand side of your footer, you need to adjust the width of the container containing your footer elements. For example, if you are using HTML and CSS, you need to set the width of the <div> element containing your footer elements to 100% instead of leaving it to an auto calculated value.

Additionally, you can reduce the overall width of your footer elements by overriding attributes such as: margin, padding, and border-width. Here is an example of what this could look like in HTML and CSS:

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div#myDiv {
  width: 100%;
  margin: 0;
  padding: 0;
  border-width: 0;
}

To add a box shadow in CSS, you can use the box-shadow property. The box-shadow property requires the x-offset, y-offset, blur and spread values as follows:

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box-shadow: [x-offset] [y-offset] [blur-radius] [spread-radius] [color];

For example, if you want a box-shadow with an x-offset of 10px, a y-offset of 20px, a blur of 5px and a spread of 10px and the color of #666, use the following code:

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box-shadow: 10px 20px 5px 10px #666;

See the CSS box-shadow property for further information.

The :last-child selector in CSS filters elements that are the last child of their parent. This can be very useful when working with block elements.

For example:

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div:last-child {
    font-weight:bold;
}

In this CSS, all divs that are the :last-child of their parent would have a font weight of bold.

More information can be found here.

In the HTML <span> tag, you can specify font-weight with the style attribute. For example, if you wanted to have your font weight be bold, you would write <span style="font-weight: bold">. If you are using a host of web languages such as HTML with CSS and JavaScript, you can specify font-weight in the style tags that are linked to the page. For example, if you wanted a section of text to be bold you would write something like this:

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.example {
    font-weight: bold;
}

and

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<span class="example">Text to be bold</span>

You can also use certain numerical values if you need a specific font weight. For example, 800 would result in a font weight of 800% or "extra-bold". A list of numerical values for font weights can be found here.

To change the background color of a website using CSS, add the property background-color to the element you want to apply the color to. For example, to change the background color of the body of the page:

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body {
  background-color: #ffffff;
}

You can also use color names, rgb, rgba, hsl or hsla values. For a list of possible values, see this page.

In CSS3, you can specify an opacity on elements such as background but not on text. To achieve the desired effect, you can either wrap each text in a separate container or use a pseudo-element like ::before and ::after to generate a layer behind the text and apply the opacity there. For example:

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div {
    background: rgba(0,0,0,0.5);
}

The backdrop-filter CSS property lets you apply graphical effects such as blurring or color shifting to the area behind an element. These effects can then be combined with clipping and typographic techniques to create a wide range of creative effects.

To use backdrop-filter, you’ll need to include the prefixes for different browsers. The code should look something like this:

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-webkit-backdrop-filter: blur(5px);
        backdrop-filter: blur(5px);

For more information and examples, you can refer to the MDN Documentation.

You can use the CSS opacity property to create a transparent element. opacity is a value between 0 (fully transparent) and 1 (fully opaque). For example:

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element {
    opacity: 0.5;
}

More information can be found here.

To make an element with opacity 50% but have the text inside be full opacity you can use the CSS opacity and rgba property, such as:

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.element {
  opacity: 0.5;
  color: rgba(0, 0, 0, 1);
}

This creates an element with 50% opacity while the text inside the element will be fully opaque. More information on rgba and opacity can be found on the MDN Web Docs.

To use CSS to add a gradient to an HTML page, you can use the background-image property with linear-gradient() as the value. The CSS code to do this looks like this:

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body {
 background-image: linear-gradient(red, yellow);
}

This creates a linear gradient that goes from red to yellow. More information and examples for creating gradients with CSS can be found in the MDN web docs.

The difference between margin and padding is that margin is the space outside of a box-like element, such as a <div>, while padding is the space inside of a box-like element.

Margin defines the space between the box-like element and anything outside of it, such as other elements within the same page, or the edge of the page/window itself. Padding defines the space between the outer edges of a box-like element and its content, such as text or images.

For example, in CSS a box-like element can be styled like this:

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div {
  margin: 10px 20px 30px 40px; /* Top Right Bottom Left */
  padding: 10px 20px 30px 40px; /* Top Right Bottom Left */
}

This will cause the element to have 10px of top margin, 20px of right margin, 30px of bottom margin, and 40px of left margin, and 10px of top padding, 20px of right padding, 30px of bottom padding and 40px of left padding.

For more information, refer to this article.

In CSS, padding is the space between an element's border and its content. By specifying a padding value, we can control how much space is added around an element's content. The syntax for padding is padding: top right bottom left;, or a single value to apply the same padding on all four sides of an element. In the following example, padding of 10px has been applied to an element:

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.element {
    padding: 10px;
}

If only two values are specified, the first value applies to the top and bottom, and the second value applies to the left and right. If only three values are specified, the first value applies to the top, the second to the left and right, and the third to the bottom.

More information on CSS padding can be found here.

You can use the <animation> style property in CSS to create an infinite animated gradient. An example implementation is provided below.

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body {
    background: linear-gradient(90deg, #FF0000, #FFFF00);
    background-size: 400% 400%;
    animation: gradient 10s ease infinite;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

For more information about the <animation> style property, you can visit the MDN page.

In CSS, you can achieve the desired font-weight by using the font-weight property in the element's style. For example, font-weight: bold; would set the font-weight of the element to bold. To use this property, you place the font-weight property directly after the font-stype property. You can also specify the font-weight as a number between 100 and 900, where 400 is the normal weight of a font. For reference, you can consult this link.

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p {
    font-weight: bold;
}

CSS Variables, also known as Custom Properties, can be used to store and reference values that can be reused throughout different parts of the style sheet. They are declared within a style sheet using the -- syntax. For example:

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:root {
    --main-bg-color: #FFF;
}

body {
    background-color: var(--main-bg-color);
}

More information on CSS Variables can be found here: https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_variables

The best way to show a video in CSS is to use the video element. The video element allows you to embed videos into an HTML page and manipulate them using CSS. You can set the size, adjust margins, or even style the video player with CSS.

Example:

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<video width="320" height="240" controls>
   <source src="movie.mp4" type="video/mp4">
</video>

For more information, please refer to this tutorial: How to embed Video using HTML5.

CSS keyframes allow you to create animations that gradually change from one style to another. To create a keyframe, you must first specify the name of the animation using the @keyframes CSS at-rule, followed by your keyframe blocks. For example, this code creates an animation titled 'pulse':

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@keyframes pulse {
  0% {
    transform: scale3d(.5, .5, .5);
  }
  40% {
    transform: scale3d(1, 1, 1);
  }
  100% {
    transform: scale3d(1.5, 1.5, 1.5);
  }
}

Once a keyframe animation is defined, you can apply it to any element simply by referencing the animation name. For example, this applies the 'pulse' animation to an element with a class of '

1. Start by setting up your HTML and CSS. Create an element that you’ll use to achieve the 3D parallax animation.

2. Then set the position of the element to be relative or absolute.

3. Add a background image to the element.

4. Add a linear-gradient to the element and set the gradient direction from top to bottom.

5. Add a transition-duration property to the elements. This will be

CSS animation is the use of animation effects using cascading style sheets (CSS). Typically, there are two components to using CSS animation: setting up the animation using keyframes and applying the animation to an element using the animation property. CSS animation can be used to animate HTML elements like text, images, and shapes, as well as pseudo-elements. Alternatively, animations can be created using JavaScript and the DOM.