html {
    font-size: 62.5%;
}

* {
    padding: 0 auto;
    margin: 0 auto
}

.content {
    width: 100%;
    height: 100%
}

.content img {
    width: 100%;
    z-index: 10;
    position: fixed;
}

.star-box {
    width: 100%;
    height: 500px;
    z-index: 20;
    position: fixed;
    background: rgba(0, 0, 0, 0);
    opacity: .5;
    overflow: hidden;
}

.star-box span {
    display: inline-block;
    width: auto;
    position: absolute;
    border-radius: 100%;
    transition: 100s linear;
}

#shooting-star-box {
    margin: 0 auto;
    width: 100%;
    height: 500px;
    position: fixed;
    background: rgba(0, 0, 0, 0);
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    overflow: hidden;
}

.star {
    display: block;
    width: 1px;
    background: transparent;
    position: relative;
    opacity: 0;
    /*过渡动画*/

    animation: star-fall 3s linear infinite;
    -webkit-animation: star-fall 3s linear infinite;
    -moz-animation: star-fall 3s linear infinite;
}

.star:after {
    content: '';
    display: block;
    border: 0px solid #fff;
    border-width: 0px 90px 2px 90px;
    border-color: transparent transparent transparent rgba(255, 255, 255, .5);
    box-shadow: 0 0 1px 0 rgba(255, 255, 255, .1);
    /*变形*/

    transform: rotate(-45deg) translate3d(1px, 3px, 0);
    -webkit-transform: rotate(-45deg) translate3d(1px, 3px, 0);
    -moz-transform: rotate(-45deg) translate3d(1px, 3px, 0);
    transform-origin: 0% 100%;
    -webkit-transform-origin: 0% 100%;
    -moz-transform-origin: 0% 100%;
}
@keyframes star-fall {
    0% {
        opacity: 0;
        transform: scale(0.5) translate3d(0, 0, 0);
        -webkit-transform: scale(0.5) translate3d(0, 0, 0);
        -moz-transform: scale(0.5) translate3d(0, 0, 0);
    }
    50% {
        opacity: 1;
        transform: translate3d(-200px, 200px, 0);
        -webkit-transform: translate3d(-200px, 200px, 0);
        -moz-transform: translate3d(-200px, 200px, 0);
    }
    100% {
        opacity: 0;
        transform: scale(1.2) translate3d(-300px, 300px, 0);
        -webkit-transform: scale(1.2) translate3d(-300px, 300px, 0);
        -moz-transform: scale(1.2) translate3d(-300px, 300px, 0);
    }
}

.login-box {
    position: fixed;
    z-index: 40;
    width: 30%;
    margin-left: 35%;
    height: 100%;
}

.log-box {
    width: 100%;
    height: 60px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 1000px;
    margin-top: 10%;
}

.log-box:first-child {
    margin-top: 45%;
}

.btn {
    clear: both;
    width: 20%;
    border: none;
    margin-top: 10%;
    background: rgba(255, 255, 255, 0);
    color: rgba(255, 255, 255, 0.75);
    font-size: 2.0rem;
    margin-left: 40%;
    outline: none;
}

.btn:hover{
    cursor: default;
}

.log-icon {
    width: 15%;
    height: 100%;
    margin-left: 3%;
    float: left;
    text-align: center;
    font-size: 1.2rem;
    line-height: 85px;
    color: rgba(187, 183, 177, 0.75);
}

.log-input {
    width: 71%;
    height: 100%;
    border: none;
    font-size: 2.0rem;
    color: rgba(255, 255, 255, 0.75);
    background: rgba(255, 255, 255, 0);
}