In HTML, you can add a width attribute to the <img> tag to specify the width of the image.

For example:

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<img src="sampleImage.png" width="500" />

The width attribute takes a pixel value, thus specifying the width of the image to be 500 px.

Or, in CSS, you can use the following:

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img {
  width: 500px;
}

You can use the CSS width and height properties to control the size of an image:

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img {
  width: 400px;
  height: 300px;
}

You can center a div using the CSS property margin: 0 auto;. For example:

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div {
  margin: 0 auto;
  width: 500px;
  background-color: #f1f1f1;
}

You can use the margin: auto; property with a fixed width in either CSS or HTML to make sure your card stays centered on the page. Here is an example:

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.card {
  width: 500px;
  margin: auto;
}

In Tailwind CSS, you can add custom breakpoints with a custom media query as follows:

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@media (width: 703px) {
  /* your custom CSS goes here */
}

You can also use the short form of Tailwind CSS:

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@screen w-703 {
  /* your custom CSS goes here */
}

In Tailwind CSS you can add custom breakpoints by defining the breakpoints within the theme.breakpoints object within your Tailwind configuration. For example:

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// tailwind.config.js
module.exports = {
  theme: {
    breakpoints: {
      sm: '576px',
      md: '768px',
      lg: '992px',
      xl: '1200px',
      xxl: '1440px',
      custom: '703px'
    }
  }
}

You can use the CSS border property to add a border to images. The border property takes the following syntax:

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img { 
  border: <width> <style> <color>;
}

The width value determines the thickness of the border. Common values are 1px or 2px.

The style value determines the type of border. Common values are solid, dotted, dashed or double.

The color value determines the color of the border. This can be a hexadecimal color code, an RGB color code or one of the standard colors (e.g. black).

For more information on the border property, refer to the Mozilla Developer Network Web Documentation.

Example:

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img { 
  border: 2px dashed orange;
}

There could be several reasons why your ul element is not being centered. One common reason is failing to specify a proper width to the ul element. In order to center an ul, you must set a width and then use the CSS margin: auto property. You can also use Flexbox to center the ul. For example, in your CSS file, you can add the following code:

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ul{
  display: flex;
  justify-content: center;  
}

More info on how to center an ul can be found at this link.

To center a div with CSS, set the element's margin to auto and the width to a fixed pixel or percentage value. The element will then take up the specified width, and the remaining space will be split equally between the left and right margins.

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div {
  margin: auto;
  width: 300px;
}

For more information, check out this W3 Schools article.

The code to create a button with a width of 50px would depend on which technology you are using.

For HTML, you could use the following:

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<button style="width:50px">My Button</button>

For CSS, you could use the following:

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button {
  width: 50px;
}

Alternatively, if you are using a UI library such as Bootstrap or Material UI, it might have specific classes for more complex styling. Here's an example using Bootstrap classes:

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<button class="btn btn-primary btn-sm">My Button</button>

In Bootstrap 4, column width can be adjusted using the classes col-* or col-lg-* for wider columns and col-sm-* for narrower columns.

For example, setting col-sm-4 gives a column width of 33.3333% for extra small devices, and setting col-4 gives a column width of 25% for all device sizes. You can also use fractional numbers (for example, col-6.5).

You can combine these classes to give different column widths per device size, as shown below.

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<div class = "row">
   <div class = "col-12 col-lg-6 col-md-8"> Column 1</div>
   <div class = "col-12 col-lg-6 col-md-4"> Column 2 </div>
</div>

In the example above, Column 1 will be 100% width for extra small devices, 50% width for large devices, and 62.5% width for medium devices, while Column 2 will be 100% width for extra small and medium devices, and 50% for large devices.

For more information, see the docs on the Bootstrap 4 grid system.

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;
}