css3-进度条颜色跟随效果

css3-进度条颜色跟随效果

html:

    <section class="container">
        <div class="loading-bar"></div>
    </section>

css:

    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        html,body{
            width: 100%;
            height: 100%;
        }
        body{
            animation: background-animate 5s infinite;
        }
        .container{
            width: 50%;
            background-color: #fff;
            margin: 280px auto 100px;
            padding: 20px 40px;
            border-radius: 4px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.5);
        }
        .loading-bar{
            display: inline-block;
            width: 100%;
            height: 10px;
            background-color: #f1f1f1;
            box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
            border-radius: 4px;
            overflow: hidden;
            position: relative;
        }
        .container .loading-bar::after{
            content: '';
            width: 0;
            height: 100%;
            border-radius: 4px;
            position: absolute;
            left: 0;
            box-shadow: inset 0 0  5px rgba(0,0,0,0.2);
            animation: load-animate 5s infinite;
        }
        /* 整个效果分为三步
        我们先让它快起来,再让它慢起来,
        设置背景色渐变,红色-黄色-深黄色
         */

        @keyframes background-animate{
            0%{
                background-color: #ff6369;
            }
            50%{
                background-color: #ffe669;
            }
            100%{
                background-color: #d6e663;
            }
        }
        /* 给body标签添加动画效果,实现背景渐变的效果
背景颜色,随着滚动条的颜色进行改变,
滚动条颜色变化,背景颜色跟随变化.
 */
/* 同步使用关键帧动画，并且时间要保持一致 */
        @keyframes load-animate {
            0%{
                width: 0%;
                background-color: #ff6369;
            }
            50%{
                width: 70%;
                background-color: #ffe669;
            }
            100%{
                width: 100%;
                background-color: #d6e663;
            }
        }
    </style>