Welcome to CSS

CSS (Cascading Style Sheets) styles your HTML elements and makes your website look amazing.

/* Link CSS to HTML */
<link rel="stylesheet" href="style.css">

/* Example */
<h1>Hello</h1>
<p>This is styled text</p>
    

Selectors tell CSS which HTML elements to style.

/* Element Selector */
p { color: red; }

/* Class Selector */
.myClass { font-size: 20px; }

/* ID Selector */
#myId { background: yellow; }
    

Learn how to change colors, backgrounds, and gradients.

body {
  background-color: #0d1b2a;
  color: #00ff00;
}

h1 {
  background: linear-gradient(90deg, #00ff00, #00ccff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
    

CSS controls font family, size, weight, and text effects.

p {
  font-family: 'Share Tech Mono', monospace;
  font-size: 16px;
  font-weight: bold;
  text-shadow: 0 0 5px #00ff00;
}
    

Every HTML element is a box. CSS controls margin, border, padding, and content.

div {
  width: 200px;
  padding: 20px;
  border: 2px solid #00ff00;
  margin: 10px;
}
    

Control how elements appear and occupy space.

div {
  display: block;    /* block, inline, inline-block, flex */
  visibility: visible; /* visible, hidden */
}
    

Move elements with static, relative, absolute, fixed, sticky.

div {
  position: relative;
  top: 20px;
  left: 30px;
}
header {
  position: fixed;
  top: 0;
  width: 100%;
}
    

Flexbox helps align items in rows or columns easily.

.container {
  display: flex;
  flex-direction: row;   /* row or column */
  justify-content: center;  /* start, end, center, space-between */
  align-items: center;      /* top, center, bottom */
}
    

CSS Grid helps create 2D layouts with rows and columns.

.container {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-gap: 10px;
}
.item {
  background: #00ff00;
}
    

Add smooth effects and animations to your elements.

button {
  background: #00ff00;
  transition: 0.3s;  /* smooth hover */
}
button:hover {
  background: #00cc00;
  transform: scale(1.1);
}

@keyframes blink {
  0% { opacity: 0; }
  50% { opacity: 1; }
  100% { opacity: 0; }
}
span.blink { animation: blink 1s infinite; }
    

Use colors, gradients, and background images to style elements.

div {
  background-color: #0d1b2a;
  color: #00ff00;
  background-image: linear-gradient(to right, #0d1b2a, #001122);
  background-size: cover;
}
    

Control font family, size, weight, line height, and letter spacing.

p {
  font-family: 'Share Tech Mono', monospace;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 1px;
  text-transform: uppercase;
}
    

Add borders, rounded corners, and outlines to elements.

div {
  border: 2px solid #00ff00;
  border-radius: 10px; /* rounded corners */
  outline: 3px dashed #00cc00;
  outline-offset: 5px;
}
    

Space inside and outside elements with padding and margin.

div {
  margin: 20px;    /* space outside */
  padding: 15px;   /* space inside */
}
section {
  margin-top: 50px;
}
    

Control content visibility and stacking order.

div {
  overflow: hidden;  /* hidden, scroll, auto */
  position: relative;
  z-index: 10;      /* stacking order */
}
.modal {
  z-index: 1000;
}
    

Style elements on hover, focus, active states, etc.

a:hover { color: #00cc00; }
input:focus { border-color: #00ff00; }
button:active { transform: scale(0.95); }
li:nth-child(odd) { background: #001122; }
    

Add content before or after elements and style parts of text.

p::first-letter { font-size: 2rem; color: #00ff00; }
p::before { content: "🔥 "; }
p::after { content: " 🌟"; }
    

Add depth with shadows.

div {
  box-shadow: 0 4px 15px rgba(0,255,0,0.5);
}
h1 {
  text-shadow: 2px 2px 5px #00ff00;
}
    

Make your page look good on all devices.

@media screen and (max-width: 768px) {
  body { background-color: #001122; }
  .container { flex-direction: column; }
}
@media screen and (min-width: 769px) {
  .container { flex-direction: row; }
}
    

Create colorful gradients for backgrounds.

div {
  background: linear-gradient(to right, #00ff00, #001122);
}
button {
  background: radial-gradient(circle, #0d1b2a, #00ff00);
}
    

Smoothly animate property changes on hover or action.

button {
  background-color: #0d1b2a;
  color: #00ff00;
  transition: background-color 0.5s, transform 0.3s;
}
button:hover {
  background-color: #00cc00;
  transform: scale(1.1);
}
    

Create keyframe animations for dynamic effects.

@keyframes slideIn {
  0% { transform: translateX(-100%); opacity: 0; }
  100% { transform: translateX(0); opacity: 1; }
}
div {
  animation: slideIn 1s ease-in-out forwards;
}
    

Use flexbox to align and distribute elements efficiently.

.container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.item { flex: 1; margin: 10px; }
    

Create grid layouts with rows, columns, and gaps.

.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 20px;
}
.grid-item {
  background-color: #0d1b2a;
  color: #00ff00;
  padding: 20px;
}
    

Use custom properties to simplify color and style management.

:root {
  --main-color: #00ff00;
  --bg-color: #0d1b2a;
  --padding: 15px;
}
div {
  background-color: var(--bg-color);
  color: var(--main-color);
  padding: var(--padding);
}
    

Use static, relative, absolute, fixed, and sticky positions.

div { position: relative; top: 10px; left: 20px; }
.modal { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
header { position: sticky; top: 0; background: #001122; }
    

Create complex shapes and hide overflow creatively.

img {
  clip-path: circle(50% at 50% 50%);
}
div {
  -webkit-mask-image: linear-gradient(to bottom, transparent, black);
}
    

Add blur, brightness, contrast, and more effects.

img { filter: blur(2px) brightness(120%); }
div { backdrop-filter: blur(5px) contrast(120%); }
    

Blend layers and images creatively.

img {
  mix-blend-mode: multiply;
}
div {
  background-color: #00ff00;
  mix-blend-mode: overlay;
}
    

Combine flex, grid, media queries, and variables for pro layouts.

:root { --gap: 20px; }

.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--gap);
}
@media screen and (max-width: 600px) {
  .container { grid-template-columns: 1fr; }
}