CSS Cheat Sheet

A comprehensive guide to essential CSS properties and techniques for web development.

Basic Syntax

selector {
    property: value;
    another-property: another-value;
}

Selectors

/* Element selector */
p {
    color: blue;
}

/* Class selector */
.my-class {
    font-size: 16px;
}

/* ID selector */
#my-id {
    background-color: yellow;
}

/* Attribute selector */
input[type="text"] {
    border: 1px solid gray;
}

/* Pseudo-classes */
a:hover {
    color: red;
}

/* Descendant selector */
div p {
    margin: 10px;
}

/* Child selector */
ul > li {
    list-style: none;
}

Text and Font Properties

.text-styles {
    font-family: Arial, sans-serif;
    font-size: 18px;
    font-weight: bold;
    font-style: italic;
    text-align: center;
    text-decoration: underline;
    text-transform: uppercase;
    line-height: 1.5;
    letter-spacing: 2px;
    color: #333;
}

Box Model

.box-model {
    width: 200px;
    height: 100px;
    padding: 20px;
    border: 2px solid black;
    margin: 10px;
    background-color: lightblue;
}

Colors and Backgrounds

.color-examples {
    /* Color formats */
    color: red;
    color: #ff0000;
    color: rgb(255, 0, 0);
    color: rgba(255, 0, 0, 0.5);
    color: hsl(0, 100%, 50%);
    
    /* Background properties */
    background-color: lightgreen;
    background-image: url('image.jpg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

Layout - Flexbox

.flex-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px;
}

.flex-item {
    flex: 1;
    flex-grow: 1;
    flex-shrink: 0;
    flex-basis: auto;
}

Layout - Grid

.grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: 100px 200px;
    grid-gap: 10px;
    grid-template-areas: 
        "header header header"
        "sidebar main main";
}

.grid-item {
    background-color: lightcoral;
    padding: 20px;
}

Positioning

.positioning {
    position: static;    /* Default */
    position: relative;  /* Relative to normal position */
    position: absolute;  /* Relative to positioned parent */
    position: fixed;     /* Relative to viewport */
    position: sticky;    /* Sticky positioning */
    
    top: 10px;
    right: 20px;
    bottom: 30px;
    left: 40px;
    z-index: 100;
}

Borders and Shadows

.borders-shadows {
    border: 2px solid black;
    border-radius: 10px;
    border-top: 3px dashed red;
    border-right: 3px dotted blue;
    
    box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

Transforms and Animations

.transform {
    transform: rotate(45deg);
    transform: scale(1.2);
    transform: translate(50px, 100px);
    transform: skew(20deg, 10deg);
}

.animation {
    animation: slideIn 2s ease-in-out;
    transition: all 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-100px); }
    to { opacity: 1; transform: translateX(0); }
}

Media Queries (Responsive Design)

/* Mobile first approach */
.responsive {
    width: 100%;
    padding: 10px;
}

/* Tablet styles */
@media screen and (min-width: 768px) {
    .responsive {
        width: 50%;
        padding: 20px;
    }
}

/* Desktop styles */
@media screen and (min-width: 1024px) {
    .responsive {
        width: 33.33%;
        padding: 30px;
    }
}

Common CSS Utilities

/* Display utilities */
.show { display: block; }
.hide { display: none; }
.invisible { visibility: hidden; }

/* Text utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Margin and padding utilities */
.m-0 { margin: 0; }
.p-2 { padding: 0.5rem; }
.mt-4 { margin-top: 1rem; }

/* Float utilities */
.float-left { float: left; }
.float-right { float: right; }
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

This CSS cheat sheet covers the most essential properties and techniques for web styling. Practice with these properties to master CSS!