loading效果

css

*{
        margin: 0;
        padding: 0;
    }
     #load{
        width: 100%;
        height: 100%;
        display: block;
        position: absolute;
        z-index:1999 !important;
        background-color: rgba(0,0,0,0.5);
    }
    #loadmain {
        width: 400px;
        height: 50px;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        display: flex;
        justify-content: center;
        align-items: center;
    }

    #loadmain>div:nth-child(2) {
        width: 150px;
        height: 20px;
        margin-left: 5px;
        font-size: 18px;
        font-weight: 800;
        color: #fff;
        font-family:'Times New Roman','sans-serif', 宋体, 楷体;
    }

    .loading {
        width: 60px;
        height: 20px;
    }

    .loading span {
        display: inline-block;
        width: 8px;
        height: 100%;
        border-radius: 4px;
        background: #ccc;
        -webkit-animation: load 1s ease infinite;
    }

    dot {
        display: inline-block;
        height: 1em;
        line-height: 1;
        text-align: left;
        vertical-align: -.25em;
        overflow: hidden;
       
    }

    dot::before {
        display: block;
        content: '...\A..\A.';
        white-space: pre-wrap;
        animation: dot 2s infinite step-start both;
    }

    @keyframes dot {
        33% {
            transform: translateY(-2em);
        }

        66% {
            transform: translateY(-1em);
        }
    }

    @-webkit-keyframes load {
        0%,
        100% {
            height: 20px;
            background: #ccc;
        }
        50% {
            height: 50px;
            margin: -15px 0;
            background: lightblue;
        }
    }

    .loading span:nth-child(2) {
        -webkit-animation-delay: 0.3s;
    }

    .loading span:nth-child(3) {
        -webkit-animation-delay: 0.5s;
    }

    .loading span:nth-child(4) {
        -webkit-animation-delay: 0.7s;
    }

    .loading span:nth-child(5) {
        -webkit-animation-delay: 0.9s;
    }

html

 <div id="load">
        <div id="loadmain">
        <div class="loading">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <div>正在加载中...</div>
    </div>

    </div>

最终效果