There are a few ways to make an element transparent in CSS.
1. Using the `opacity` property: this property controls the transparency level for an element.
```
element {
opacity: 0.5; /* values range from 0 to 1 */
}
```
1. Using `rgba` color for backgrounds: `rgba` stands for “red green blue alpha”. The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).
```
element {
background-color: rgba(255, 255, 255, 0.5);
}
```
Remember that the opacity property makes the element as well as its content (like text or images) partially transparent, while `rgba` color only makes the background transparent.
