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

在一個(gè)元素上支持多個(gè)類。

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

覆蓋所有以前的樣式規(guī)則。

h1 { } 
#job-title { }
div.hero { }
div > p { }

請(qǐng)參閱：選擇器

color: #2a2aff;
color: green;
color: rgb(34, 12, 64, 0.6);
color: hsla(30 100% 50% / 0.6);

請(qǐng)參閱：顏色

背景

background-color: blue;
background-image: url("nyan-cat.gif");
background-image: url("../image.png");

請(qǐng)參閱：背景

.page-title {
    font-weight: bold;
    font-size: 30px;
    font-family: "Courier New";}

請(qǐng)參閱：字體

.box {
    position: relative;
    top: 20px;
    left: 20px;}

另見：位置

animation: 300ms linear 0s infinite;animation: bounce 300ms linear infinite;

參見：動(dòng)畫

/* 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;}

請(qǐng)參閱：彈性盒靈活技巧

#container {
  display: grid;
  grid: repeat(2, 60px) / auto-flow 80px;}#container > div {
  background-color: #8ca0ff;
  width: 50px;
  height: 50px;}

請(qǐng)參閱：網(wǎng)格布局

counter-set: subsection;
counter-increment: subsection;
counter-reset: subsection 0;:root {
  --bg-color: brown;}element {
  background-color: var(--bg-color);}

請(qǐng)參閱：動(dòng)態(tài)內(nèi)容

另請(qǐng)參閱：類型/類/ID/通用選擇器

另請(qǐng)參閱：相鄰/兄弟/子選擇器

另請(qǐng)參閱：屬性選擇器

font-family: Arial, sans-serif;
font-size: 12pt;
letter-spacing: 0.02em;

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

color: red;
color: orange;
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 */

.column {
    max-width: 200px;
    width: 500px;}

另見：max-width /min-width /max-hight /min-hight

.block-one {
    margin: 20px;
    padding: 10px;}

另請(qǐng)參閱：margin /padding

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

另請(qǐng)參閱：box-sizing

.invisible-elements {
    visibility: hidden;}

另見：visibility

div {
    margin: auto;}

另見：margin

.small-block {
    overflow: scroll;}

另見：overflow

.container {
  display: flex;}

容器 Container

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

.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: 100px;
  height: 100px;
  margin: auto;}

.container {
  display: flex;/* vertical */
  align-items: center;/* horizontal */
  justify-content: center;}

.container > .top {
 order: 1;}.container > .bottom {
 order: 2;}

.container {
  display: flex;
  flex-direction: column;}.container > .top {
  flex: 0 0 100px;}.container > .content {
  flex: 1 0 auto;}

一個(gè)固定高度的頂部欄和一個(gè)動(dòng)態(tài)高度的內(nèi)容區(qū)域。

.container {
  align-items: center;}

垂直居中所有項(xiàng)目。

#grid-container {
    display: grid;
    width: 100px;
    grid-template-columns: 20px 20% 60%;}

.grid {
    display: grid;
    width: 100px;
    grid-template-columns: 1fr 60px 1fr;}

/*The distance between rows is 20px*/
/*The distance between columns is 10px*/
#grid-container {
    display: grid;
    grid-gap: 20px 10px;}

#grid-container {
    display: block;}

CSS 語法：

• 網(wǎng)格行：網(wǎng)格行開始/網(wǎng)格行結(jié)束；

例子

.item {
    grid-row: 1 / span 2;}

#grid-container {
    display: inline-grid;}

.grid {
    display: grid;
    grid-template-columns: 100px minmax(100px, 500px) 100px;}

CSS 語法：

• 網(wǎng)格行開始：自動(dòng)|行行；
  
• 網(wǎng)格行端：自動(dòng)|行行|跨度n；

例子

grid-row-start: 2;
grid-row-end: span 2;

grid-row-gap: length;

任何合法的長(zhǎng)度值，如 px 或 %。0 是默認(rèn)值

.item1 {
    grid-area: 2 / 1 / span 2 / span 3;}

#container {
    display: grid;
    justify-items: center;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-gap: 10px;}

.item {
    grid-area: nav;}.grid-container {
    display: grid;
    grid-template-areas:
    'nav nav . .'
    'nav nav . .';}

#grid-container {
    display: grid;
    justify-items: start;}.grid-items {
    justify-self: end;}

網(wǎng)格項(xiàng)位于行的右側(cè)（末尾）。

定義 CSS 變量

:root {
  --first-color: #16f;
  --second-color: #ff7;}

變量用法

#firstParagraph {
  background-color: var(--first-color);
  color: var(--second-color);}

另請(qǐng)參閱：CSS 變量

/* 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;

另見：計(jì)數(shù)器集

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, ".") " ";}

html {
    scroll-behavior: smooth;}

單擊我，頁面將平滑滾動(dòng)到入門