CSS 3 CheatSheet

CSS is the language we use to style a Web page.

CSS allows you to create great-looking web pages

CSS stands for Cascading Style Sheets

CSS describes how HTML elements are to be displayed on screen, paper, or in other media

CSS saves a lot of work. It can control the layout of multiple web pages all at once

External stylesheets are stored in CSS files

<!-- External stylesheet -->
<link href="./path/to/stylesheet/style.css" rel="stylesheet" type="text/css">


<!-- Internal stylesheet -->
<style>
body {
    background-color: red;
}
</style>


<!-- Inline styles -->
<h2 style="text-align: left;">Left text</h2>

<p style="color: red; font-size: 20px;">red, 20-point text</p>

<div class="classname"></div>

<div class="class1 ... classn"></div>

.post-title {
    color: red !important;
    background-color: blue !important;
}

h1 { } 

#job-title { }

div.hero { }

div > p { }

color: #2a2aff;

color: green;

color: rgb(34, 12, 64, 0.6);

color: hsla(30 100% 50% / 0.6);

background-color: red;

background-image: url("corgi-dog.gif");

background-image: url("../image.png");

background-image: url("../image.jpg");

.page-title {
    font-weight: bold;
    font-size: 50px;
    font-family: "Courier New";
}

.box {
    position: relative;
    top: 50px;
    left: 30px;
}

animation: 300ms linear 0s infinite;


animation: bounce 300ms linear infinite;

/* This is a single line comment */

/* This is a 
   multi-line comment */

div {
    display: flex;
    justify-content: center;
}


div {
    display: flex;
    justify-content: flex-start;
}

#container {
  display: grid;
  grid: repeat(2, 60px) / auto-flow 80px;
}


#container > div {
  background-color: #8ca0ff;
  width: 50px;
  height: 50px;
}

counter-set: subsection;

counter-increment: subsection;

counter-reset: subsection 0;

:root {
  --bg-color: brown;
}


element {
  background-color: var(--bg-color);
}

<!-- Groups Selector -->
h1, h2 {
    color: greem;
}


<!-- Chaining Selector -->
h3.section-heading {
    color: green;
}


<!-- Attribute Selector -->
div[attribute="your value in here"] {
    background-color: green;
}


<!-- First Child Selector -->
p:first-child {
    font-weight: bold;
}


<!-- No Children Selector -->
.box:empty {
  background: lime;
  height: 50px;
  width: 50px;
}

font-family: Arial, sans-serif;

font-size: 12pt;

letter-spacing: 0.02em;

/* Hello */
text-transform: capitalize;


/* HELLO */
text-transform: uppercase;


/* hello */
text-transform: lowercase;

@font-face {
    font-family: 'Glegoo';
    src: url('../Glegoo.woff');
}

color: green;

color: red;

color: blue;

color: tan;

color: rebeccapurple;

color: #090;

color: #009900;

color: #090a;

color: #009900aa;

color: rgb(34, 12, 64, 0.6);

color: rgba(34, 12, 64, 0.6);

color: rgb(34 12 64 / 0.6);

color: rgba(34 12 64 / 0.3);

color: rgb(34.0 12 64 / 60%);

color: rgba(34.6 12 64 / 30%);

color: hsl(30, 100%, 50%, 0.6);

color: hsla(30, 100%, 50%, 0.6);

color: hsl(30 100% 50% / 0.6);

color: hsla(30 100% 50% / 0.6);

color: hsl(30.0 100% 50% / 60%);

color: hsla(30.2 100% 50% / 60%);

color: inherit;

color: initial;

color: unset;

color: transparent;

color: currentcolor; /* keyword */

background: url(img_man.jpg) no-repeat center;


background: url(img_flwr.gif) right bottom no-repeat, url(paper.gif) left top repeat;


background: rgb(2,0,36);


background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(13,232,230,1) 35%, rgba(0,212,255,1) 100%);

.column {
    max-width: 50px;
    width: 300px;
}

.block-one {
    margin: 15px;
    padding: 60px;
}

.container {
    box-sizing: border-box;
}

.invisible-elements {
    visibility: hidden;
}

div {
    margin: auto;
}

.small-block {
    overflow: scroll;
}

/* @keyframes duration | timing-function | delay |
   iteration-count | direction | fill-mode | play-state | name */
animation: 3s ease-in 1s 2 reverse both paused slidein;

/* @keyframes duration | timing-function | delay | name */
animation: 3s linear 1s slidein;

/* @keyframes duration | name */
animation: 3s slidein;

animation: 4s linear 0s infinite alternate move_eye;
animation: bounce 300ms linear 0s infinite normal;
animation: bounce 300ms linear infinite;
animation: bounce 300ms linear infinite alternate-reverse;
animation: bounce 300ms linear 2s infinite alternate-reverse forwards normal;

.one('webkitAnimationEnd oanimationend msAnimationEnd animationend')

.container {
  display: flex;
}


.container > div {
  flex: 1 1 auto;
}

.container {
  display: flex;
  display: inline-flex;
  flex-direction: row;            /* ltr - default */
  flex-direction: row-reverse;    /* rtl */
  flex-direction: column;         /* top-bottom */
  flex-direction: column-reverse; /* bottom-top */
  flex-wrap: nowrap; /* one-line */
  flex-wrap: wrap;   /* multi-line */
  align-items: flex-start; /* vertical-align to top */
  align-items: flex-end;   /* vertical-align to bottom */
  align-items: center;     /* vertical-align to center */
  align-items: stretch;    /* same height on all (default) */
  justify-content: flex-start;    /* [xxx        ] */
  justify-content: center;        /* [    xxx    ] */
  justify-content: flex-end;      /* [        xxx] */
  justify-content: space-between; /* [x    x    x] */
  justify-content: space-around;  /* [ x   x   x ] */
  justify-content: space-evenly;  /* [  x  x  x  ] */
}

.container > div {

  /* This: */
  flex: 1 0 auto;

  /* Is equivalent to this: */
  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: auto;
  order: 1;
  align-self: flex-start;  /* left */
  margin-left: auto;       /* right */
  
}

.container {
  display: flex;
}


.container > div {
  width: 250px;
  height: 350px;
  margin: auto;
}

.container {
  display: flex;

  /* vertical */
  align-items: center; 

  /* horizontal */
  justify-content: center;
}

.container > .top {
 order: 3;
}

.container > .bottom {
 order: 4;
}

.container {
  display: flex;
  flex-direction: column;
}


.container > .top {
  flex: 0 0 100px;
}


.container > .content {
  flex: 1 0 auto;
}

.container {
  display: flex;
}


/* the 'px' values here are just suggested percentages */
.container > .checkbox { flex: 1 0 20px; }

.container > .subject  { flex: 1 0 400px; }

.container > .date     { flex: 1 0 120px; }

.container {
  align-items: center;
}

.menu > .left  { 
    align-self: flex-start; 
}


.menu > .right { 
    align-self: flex-end; 
}

/* Define CSS Variable */
:root {
  --first-color: #16f;
  --second-color: #ff7;
}


/* Variable Usage */
#box {
  background-color: var(--first-color);
  color: var(--second-color);
}

/* Set "my-counter" to 0 */
counter-set: my-counter;


/* Increment "my-counter" by 1 */
counter-increment: my-counter;


/* Decrement "my-counter" by 1 */
counter-increment: my-counter -1;


/* Reset "my-counter" to 0 */
counter-reset: my-counter;

body { 
    counter-reset: section; 
}


h3::before {
  counter-increment: section; 
  content: "Section." counter(section);
}


ol {
  counter-reset: section;   
  list-style-type: none;
}


li::before {
  counter-increment: section;
  content: counters(section, ".") " "; 
}