CSSに固有の概要

Question

私は、cssを使用してボックスの特定のアウトラインを作成したいと考えています。この画像のように

何か：

してください、任意のヘルプ？ :(あなたはグラデーションで見ることができ、オーバーレイのためのちょうどあなたの質問はどのように簡単な証明する

Answer 1

、背景クリップと背景サイズ：

例可http://codepen.io/gc-nomade/pen/aZbrEQ

div { 
 
    margin: 1em auto; 
 
    width: 600px; 
 
    max-width: 70%; 
 
    padding: 40px; 
 
    /* set offset here for border corners */ 
 
    background: linear-gradient(white, white) top left no-repeat, linear-gradient(white, white) top left no-repeat, linear-gradient(white, white) top right no-repeat, linear-gradient(white, white) top right no-repeat, linear-gradient(white, white) bottom left no-repeat, linear-gradient(white, white) bottom left no-repeat, linear-gradient(white, white) bottom right no-repeat, linear-gradient(white, white) bottom right no-repeat, rgba(255, 255, 255, 0.15); 
 
    /* color receive 
 
    background-clip:content-box; 
 
    so it is not drawn on padding areas */ 
 
    background-clip: border-box, border-box, border-box, border-box, border-box, border-box, border-box, border-box, content-box; 
 
    background-size: 2px 60px, 80px 2px; 
 
    /* here give length and thickness of border corners */ 
 
    color: white; 
 
} 
 
p, 
 
h2 { 
 
    padding: 1em; 
 
    margin:0; 
 
} 
 
html { 
 
    height: 100%; 
 
    background: url(http://lorempixel.com/640/480/nature/6); 
 
    background-size: cover 
 
} 
 
body { 
 
    min-height: 100%; 
 
    background: rgba(0, 0, 0, 0.5); 
 
    margin: 0; 
 
    padding: 4em; 
 
}

<div> 
 
    <h2>title</h2> 
 
    <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. 
 
    Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra. Vestibulum erat wisi, condimentum sed, commodo vitae, ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros ipsum rutrum orci, sagittis tempus 
 
    lacus enim ac dui. Donec non enim in turpis pulvinar facilisis. Ut felis. Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt quis, accumsan porttitor, 
 
    facilisis luctus, metus</p> 
 
</div>

Answer 2

。 ::beforeと::afterは、境界線の部分を隠します。 z-index。

.dirt { 
 
    position: relative; 
 
    width: 200px; 
 
    height: 100px; 
 
    line-height: 100px; 
 
    text-align: center; 
 
    background-color: rgba(251, 145, 156, 1); 
 
    border: 2px solid rgba(231, 0, 0, 1); 
 
    box-sizing: border-box; 
 
} 
 
.dirt > span { 
 
    position: relative; 
 
    z-index: 15; 
 
    background-color: rgba(255,255,255,0.5); 
 
    padding: 25px; 
 
} 
 
.dirt::after, 
 
.dirt::before { 
 
    content: ''; 
 
    position: absolute; 
 
    background-color: rgba(251, 145, 156, 1); 
 
    /*same color*/ 
 
} 
 
.dirt::before { 
 
    top: 20%; 
 
    bottom: 20%; 
 
    left: -2px; 
 
    /*border-width*/ 
 
    right: -2px; 
 
    /*border-width*/ 
 
} 
 
.dirt::after { 
 
    top: -2px; 
 
    /*border-width*/ 
 
    bottom: -2px; 
 
    /*border-width*/ 
 
    left: 20%; 
 
    right: 20%; 
 
}

<p>An example: (do not use)</p> 
 
<div class="dirt"> 
 
    <span>My little dirt text</span> 
 
</div>