我试图更好地理解CSS是如何工作的。 我有以下代码:
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@import url('https://fonts.googleapis.com/css2?family=Raleway:wght@300;400;700;900&display=swap" rel="stylesheet');
* {
box-sizing: border-box;
}
body {
margin: 0;
font-family: 'Raleway', sans-serif;
text-align: center;
}
img {
max-width: 100%;
height: auto;
}
.container {
width: 95%;
max-width: 70em;
margin: 0 auto;
}
/* typography
================== */
h1 {
font-weight: 300;
font-size: 1.7rem;
margin-top: 0;
}
p {
margin-top: 0;
line-height: 1.5;
}
p:last-of-type {
margin-bottom: 0;
}
.title {
font-size: 2.5em;
margin-top: 1em;
margin-bottom: 1.5em;
font-weight: 900;
}
.title span {
font-weight: 300;
display: block;
font-size: .9em;
}
@media(min-width:60rem) {
p {
font-size: 1.2rem;
line-height: 1.6;
}
.title {
font-size: 3.7em;
margin-bottom: 1em;
margin-top: 0;
font-weight: 900;
}
}
/* buttons */
.button {
display: inline-block;
font-size: 1.15em;
text-decoration: none;
text-transform: uppercase;
border-width: 2px;
border-style: solid;
padding: .5em 1.75em;
color: #00ff6c;
border-color: #00ff6c;
}
@media (min-width: 60rem) {
.button {
font-size: 1.5rem;
}
.button-small {
font-size: .7rem;
font-weight: 700;
}
.button-accent {
color: #00ff6c;
border-color: #00ff6c;
}
.button-accent:hover,
.button-accent:focus {
background: #00ff6c;
color: #232323;
}
}
/* header
================== */
header {
position: absolute;
margin-top: 1em;
left: 0;
right: 0;
margin: 1em;
}
nav ul {
margin: 0;
padding: 0;
list-style: none;
}
nav li {
display: inline-block;
margin: 1em;
}
nav a {
font-weight: 900;
text-decoration: none;
padding: .5em;
text-transform: uppercase;
color: #FFF;
font-size: .8rem;
}
nav a: hover,
nav a: focus {
color: #DDD;
}
@media(min-width:60rem) {
.logo {
float: left;
}
nav {
float: right;
}
}
/* home-hero
================== */
.home-hero {
background-image: url(img/hero-bg.jpg);
background-size: cover;
background-position: center;
padding: 10em 0;
color: #FFF;
}
@media (min-width: 60rem) {
.home-hero {
height: 100vh;
padding-top: 35vh;
}
}
/* hero-home
======================== */
.home-about-textbox {
background-color: #232323;
padding: 4em;
margin: 0 -2.5vw;
outline: 2px solid #00ff6c;
outline-offset: -2.5em;
color: #FFF;
position: relative;
}
.home-about-textbox h1 {
color: #00ff6c;
position: absolute;
left: 50%;
transform: translateX(-50%);
top: .75em;
background: #232323;
padding: 0 .145em;
white-space: nowrap;
}
.container {
width: 95%;
max-width: 70em;
margin: 0 auto;
background-color: mediumvioletred;
color: magenta;
}
@media (min-width: 25rem) {
h1 {
font-size: 2 rem;
}
.home-about-textbox h1 {
top: .6em;
padding: 0 .325em;
}
}
@media (min-width: 60rem) {
h1 {
font-size: 2.5rem;
}
.home-about {
background-image: url(img/who-we-are.jpg);
background-repeat: no-repeat;
padding-bottom: 10em;
}
.home-about-textbox {
width: 50%;
padding: 7em;
outline-offset: -3.75em;
margin-left: -2.5%;
top: -5em;
text-align: left;
box-shadow: 0 0 4em 0 rgba(0, 0, 0, .3);
}
.home-about-textbox h1 {
top: .75em;
left: 6rem;
position: absolute;
left: 50%;
transform: translateX(-50%);
top: .75em;
background: #232323;
padding: 0 .145em;
}
}
.container {
width: 95%;
max-width: 70em;
margin: 0 auto;
background-color: mediumvioletred;
!important color: magenta;
!important
}<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Creative Inc.</title>
<link rel="stylesheet" href="styles.css" type="text/css">
</head>
<body>
<header>
<img src="img/logo.png" alt="Creative inc. logo" class="logo">
<nav>
<ul>
<li><a href="">Home</a></li>
<li><a href="">About</a></li>
<li><a href="">Contact</a></li>
</ul>
</nav>
</header>
<section class="home-hero">
<div class="contaier">
<h1 class="title">Making things looks great
<span>for companies who make great stuff</span>
</h1>
<a href="" class="button button-accent">See Our Work</a>
</div>
</section>
<div class="container">
<section class="home-about">
<div class="home-about-textbox">
<h1>Who we are</h1>
<p>Sit by the fire drink water out of the faucet hide head under banket so no one can see cat is love, cat is life.Knock dish off table eating always hungry so favor packaging over toy.</p>
<p>
<srong>Rub face on owner.</srong>Peer out window, chatter at birds, lure then to mouth. Chase ball of string eat a plant, kill a hand, i am the best have secret plans.
</p>
</div>
</section>
</div>
</body>
</html>null
这里，home-about-textbox使用class属性以三种不同的方式定义:
`<div class="container">
<section class="home-about"> for pc media
<div class="home-about-textbox">`for mobile media
但是容器也选择“home-hero”部分: 我试图弄清楚容器的作用是什么。 当我在css样式表中选择 我在代码末尾再次选择了容器，以确保没有其他内容覆盖它（最后一个媒体声明已关闭），我使用疯狂的颜色进行样式化，但没有任何变化。 我甚至试过了！重要的规则和风格是一样的。 我的问题是: 这个容器类在代码中到底选择了什么，为什么我不能对它进行样式化？。
.container时，浏览器上的“home-about-textbox”会变成蓝色，所以我尝试改变容器的颜色，看看这个类是否真的选择了这两个部分（“home-hero”和“home-about-textbox”）。
container是一个类，它被赋予一个div标记来定义你的网页大小，所有其他元素都应该在它里面，这样它们就会将所有样式赋予它们的父级（container）
你用了！重要的错误，你应该这样用它:
background-color: red !important;
