The transform: translate(-50%, -50%); CSS property is used to move an element horizontally and vertically by a specified percentage of its own size. It is often used to center an element both horizontally and vertically within its parent container.

For example, if you have a div element with a width and height of 200px, applying transform: translate(-50%, -50%); to it will move the div 50% to the left and 50% up, effectively centering it within its parent container.

Here is an example of how it can be used:

css
 
 
Copy code
.parent-container {
  position: relative;
}

.centered-element {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* other styles */
}

In this example, the .centered-element will be positioned exactly in the center of its parent container, regardless of the size of the element.

To change the width of a container, you will need to access the CSS for that container and adjust the width property. You can do this using the width CSS property.

Here is an example of how to set the width of a container with a class name of "container" to 500 pixels in CSS:

css
 
 
Copy code
.container {
  width: 500px;
}

You can adjust the pixel value to whatever width you need for your container.

If you want to use a percentage for the width instead of pixels, you can do that too. Here is an example of how to set the width of a container to 50%:

css
 
 
Copy code
.container {
  width: 50%;
}

This will set the width to take up 50% of the parent element.

To make sure your HTML page occupies 100% height, you have to make sure that all of the elements within your HTML page have a height of 100%. Here's an example of how to achieve this with CSS:

css
 
 
Copy code
html, body {
  height: 100%;
}

/* Make sure to set the height of all parent elements as well */
.container {
  height: 100%;
}

This CSS code ensures that the html and body elements have a height of 100%. It's also important to make sure that all parent elements (such as the .container element in this example) have a height of 100% as well. This way, all of the elements in your HTML page will occupy 100% height.

You can learn more about CSS height property and units by following this link: https://www.w3schools.com/cssref/pr_dim_height.asp

With CSS you can change the size of your image using the width and height properties. You can specify the size in either percentages or pixels.

For example:

css
 
 
Copy code
img {
    width: 70%;
    height: 70%;
} 

This would set the width and height of your image to 70% of the original size.

Alternatively, if you want to set the size in pixels instead, you would use:

css
 
 
Copy code
img {
    width: 350px;
    height: 350px;
} 

This would set the width and height of your image to 350 pixels each.

The percentage data type in CSS represents a percentage. It is written as a number followed by a % symbol. For example, to set the width of an element to be 50% of the container width, the code would be width: 50%;.

More info:

• MDN Web Docs: CSS Data Types - CSS | MDN
• w3schools: CSS Percentages

javascript
 
 
Copy code
const percentage = (num1, num2) => {
 return num1/num2*100
}
percentage(3, 10) // 30

You can set font size in css by using the font-size property. The value can be specified in length units (such as px, em, or rem) or as a percentage of the parent element's font size.

For example:

css
 
 
Copy code
p {
  font-size: 12px;
}

h1 {
  font-size: 1.5em;
}

More information about font size and css properties can be found at the Mozilla Developer Network.