SOURCE

<!--  loading  -->
<div class="el-loading-mask">
<div class="el-loading-spinner g-my-spinner">
    <div class="rect1"></div>
    <div class="rect2"></div>
    <div class="rect3"></div>
    <div class="rect4"></div>
    <div class="rect5"></div>
</div>
</div>

.el-loading-mask {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgba(255, 255, 255, 1);
}

@-webkit-keyframes stretchdelay {
    0%,
    40%,
    100% {
        -webkit-transform: scaleY(0.4)
    }
    20% {
        -webkit-transform: scaleY(1.0)
    }
}

@keyframes stretchdelay {
    0%,
    40%,
    100% {
        transform: scaleY(0.4);
        -webkit-transform: scaleY(0.4);
    }
    20% {
        transform: scaleY(1.0);
        -webkit-transform: scaleY(1.0);
    }
}

.g-my-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50px !important;
    height: 60px;
    font-size: 10px;
    transform: translate(-50%, -50%);
}

.g-my-spinner > div {
    background-color: #09AAFF;
    height: 100%;
    width: 6px;
    display: inline-block;
    -webkit-animation: stretchdelay 1.2s infinite ease-in-out;
    animation: stretchdelay 1.2s infinite ease-in-out;
}

.g-my-spinner .rect2 {
    -webkit-animation-delay: -1.1s;
    animation-delay: -1.1s;
}

.g-my-spinner .rect3 {
    -webkit-animation-delay: -1.0s;
    animation-delay: -1.0s;
}

.g-my-spinner .rect4 {
    -webkit-animation-delay: -0.9s;
    animation-delay: -0.9s;
}

.g-my-spinner .rect5 {
    -webkit-animation-delay: -0.8s;
    animation-delay: -0.8s;
}