.arc {
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border-top: 2px solid #00BCD4;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    animation: rt 2s infinite linear;
}

.arc::before {
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border-top: 2px solid #2196F3;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    animation: rt 4s infinite linear reverse;
    content: "";
}

.arc::after {
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-radius: 50%;
    border-top: initial;
    border-left: initial;
    border-right: initial;
    animation: cw 1s infinite;
    content: "";
    background: #FAFAFA;
}

#myh1 {
    position: absolute;
    height: 40px;
    margin: auto;
    top: 200px;
    left: 0;
    right: 0;
    bottom: 0;
    text-transform: uppercase;
    text-align: center;
    letter-spacing: 0.1em;
    font-size: 14px;
    font-weight: lighter;
    color: black;
}

#myh1 #myspan {
    display: none;
}

#myh1::after {
    animation: txt 5s infinite;
    content: "";
}

@keyframes rt {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes cw {
    0% {
        width: 0;
        height: 0;
    }
    75% {
        width: 40px;
        height: 40px;
    }
    100% {
        width: 0;
        height: 0;
    }
}

@keyframes txt {
    0% {
        content: "加载中.";
    }
    50% {
        content: "玩命加载中..";
    }
    100% {
        content: "疯狂玩命加载中...";
    }
}