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在父元素里面设置margin：0；p元素还有margin

内外边距

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>详情</title>
    <style pyte="txet/css">
html { 
    font-size:312.5%; 
} 
body { 
    font-size: initial; 
    margin: 0; 
}

header {
    width: 100%;
    height: 0.88rem;
    background-color: #5FC0CD;
}
    </style>
</head>
<body>
    <header>
        <p>注册</p>
    </header>
</body>
</html>

任务四中滑动条的问题

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

.track {
    margin: 0 auto 10px;
    width: 95%;
    height: 60px;
    background: #ffffff; 
    .t-left {
        float: left;
        margin: 15px 0 0 2.5%;
        border-radius: 6px;
        width: 30px;
        height: 30px;
        font-size: 30px;
        text-align: center;
        line-height: 28px;
        color: #ffffff;
        background: #FBB435;
        cursor: pointer;
    }
    .t-right {
        @extend .t-left;
        float: right;
        margin: 15px 2.5% 0 0;
    }
}
.input1 {
    display: block;
    margin: 0 auto 10px;
    width: 80%;
    height: 60px;
    outline: none;
    -webkit-appearance: none; 
}
.input1::-webkit-slider-runnable-track {
    height: 8px;
    border-radius: 6px;
    box-shadow: inset 0 1px 2px gray;
    background: -webkit-linear-gradient(right,#059CFA, #059CFA) no-repeat;
    background-size: calc(100% / 14 * 4) 100%;
}
.input1::-webkit-slider-thumb {
    margin-top: -11px;
    border-radius: 15px;
    width: 30px;
    height: 30px;
    background: url(../../img/skill.jpg) 0 0/30px 30px;
    -webkit-appearance: none;
}

去除inline-block元素间间距

布局内外边距

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">

        .box {
            width: 100%;
            height: 600px;
            background-color: red;
        }

        .box1{
            display: inline-block;
            width: 100px;
            height: 200px;
            background-color: blue;
        }


    </style>

</head>
<body>

<div class="box">
    <div class="box1">124124</div>
    <div class="box1">14124</div>
    <div class="box1">141414</div>

</div>
</body>
</html>