CSS Cheat Sheet

p { color: blue; }

.class-name { font-size: 16px; }

#unique-id { background: red; }

* { margin: 0; padding: 0; }

/* This is a comment */

div p { color: blue; }

div > p { color: blue; }

h1 + p { margin-top: 0; }

h1 ~ p { color: gray; }

a[href] { color: blue; }
input[type="text"] { border: 1px solid; }

a:hover { text-decoration: underline; }
li:first-child { font-weight: bold; }

p::first-line { font-weight: bold; }
p::before { content: "→ "; }

color: red;
background: blue;

color: #ff0000;
background: #00f;

color: rgb(255, 0, 0);
background: rgb(0, 0, 255);

background: rgba(255, 0, 0, 0.5);

color: hsl(0, 100%, 50%);

background: hsla(240, 100%, 50%, 0.5);

display: flex;
display: inline-flex;

flex-direction: row;
flex-direction: row-reverse;
flex-direction: column;
flex-direction: column-reverse;

justify-content: flex-start;
justify-content: flex-end;
justify-content: center;
justify-content: space-between;
justify-content: space-around;
justify-content: space-evenly;

align-items: stretch;
align-items: flex-start;
align-items: flex-end;
align-items: center;
align-items: baseline;

flex-wrap: nowrap;
flex-wrap: wrap;
flex-wrap: wrap-reverse;

gap: 1rem;
row-gap: 1rem;
column-gap: 2rem;

flex: 1;
flex: 0 1 auto;
flex-grow: 1;
flex-shrink: 0;
flex-basis: 200px;

align-self: auto;
align-self: flex-start;
align-self: flex-end;
align-self: center;
align-self: stretch;

order: 0;
order: 1;
order: -1;

display: block;
display: inline;
display: inline-block;
display: none;

position: static;
position: relative;
position: absolute;
position: fixed;
position: sticky;

float: left;
float: right;
float: none;
clear: both;

z-index: 1;
z-index: 999;
z-index: -1;

display: grid;
grid-template-columns: 1fr 1fr 1fr;
grid-gap: 1rem;
grid-template-rows: auto;

grid-column: 1 / 3;
grid-row: 1 / 2;
grid-area: header;

margin: 10px;
margin: 10px 20px;
margin: 10px 20px 10px 20px;
margin-top: 10px;

padding: 10px;
padding: 10px 20px;
padding-left: 15px;

border: 1px solid black;
border-radius: 5px;
border-top: 2px dashed red;

width: 100px;
height: 50px;
min-width: 200px;
max-width: 100%;

box-sizing: content-box;
box-sizing: border-box;

font-family: Arial, sans-serif;
font-family: 'Times New Roman', serif;

font-size: 16px;
font-size: 1.2rem;
font-size: 150%;

font-weight: normal;
font-weight: bold;
font-weight: 700;

text-align: left;
text-align: center;
text-align: right;
text-align: justify;

text-decoration: none;
text-decoration: underline;
text-decoration: line-through;

line-height: 1.5;
line-height: 24px;