前端每日实战3.纯 CSS 创作一个容器厚条纹边框特效

<div class="box">
        <div class="content">
              <h2>What is Lorem Ipsum?</h2>
              <p>Mauris volutpat risus quis nisi tempus hendrerit. Nullam nisi urna, suscipit quis risus sed, congue congue quam. Morbi sit amet suscipit ex. Vivamus vel nulla ac libero volutpat ultrices.    </p>
       </div>
</div>

/* 内容居中显示： */
html,body,
.box .content {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
/* 画条纹背景： */
.box {
    width: 300px;
    height: 300px;
    /* linear-gradient的解说： http://www.runoob.com/cssref/func-linear-gradient.html */
    background: linear-gradient(
        -45deg,
        white 0%,
        white 25%,
        hotpink 25%,
        hotpink 50%,
        white 50%,
        white 75%,
        hotpink 75%,
        hotpink 100%
    );
    background-size: 10%;
    box-sizing: border-box;
    padding: 15px;
    animation: animate 2s linear infinite;
}

.box .content {
    background-color: white;
    flex-direction: column;
    box-sizing: border-box;
    padding: 30px;
    text-align: center;
    font-family: sans-serif;
}

.box,
.box .content {
    box-shadow: 0 0 2px deeppink,
                0 0 5px rgba(0, 0, 0, 1),
                inset 0 0 5px rgba(0, 0, 0, 1);
    border-radius: 10px;
}

.box .content h2 {
    color: deeppink;
}
.box .content p {
    color: dimgray;
}

@keyframes animate {
    from {
        background-position: 0;
    }
    
    to {
        background-position: 10%;
    }
}