Here are a few fun CSS tricks that you can use to add some creativity and flair to your website or web application:

Text Shadow: You can add a shadow to text by using the text-shadow property. For example:

h1 {

  text-shadow: 2px 2px #ff0000;

}

This will create a red shadow 2 pixels to the right and 2 pixels down from the text.

Gradient Background: You can create a gradient background using CSS by setting the background-image property to a linear or radial gradient. For example:

body {

  background-image: linear-gradient(to bottom, #ff0000, #0000ff);

}

This will create a gradient that goes from red to blue from top to bottom.

Animations: CSS animations allow you to add movement and interactivity to your website. You can use the @keyframes rule to define an animation and then apply it to an element with the animation property. For example:

@keyframes example {

  from {

    transform: translateX(0);

  }

  to {

    transform: translateX(100px);

  }

}

.element {

  animation: example 2s linear;

}

This will make the .element move horizontally 100 pixels to the right over the course of 2 seconds using a linear easing.

Transform: The transform property allows you to scale, rotate, and translate elements. For example:

.element {

  transform: rotate(45deg);

}

This will rotate the .element 45 degrees clockwise.

These are just a few of the many creative things you can do with CSS. I encourage you to explore more and see what kind of effects you can create!