html {
    background: #ffffff;
}

body {
    /* 与 base.css 同理：本页不继承 base.html，body 若不透明会盖住 z-index:-1 的粒子层 */
    background: transparent;
}

.logoico {
    width: 5%;
}

header {

    position: fixed;
    width: 100%;
    z-index: 999
}

a:hover {
    text-decoration: none;
}

main {
    padding-top: 80px;
}

.username {
    width: auto
}

canvas {
    display: block;
    vertical-align: bottom;
}

.particles-js-canvas-el {
    width: 100%;
    height: 100%;
}

.particles-js {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    display: flex;
    align-items: center;
    justify-content: center
}

.progress {
    width: 100%;
    height: 2px;
    position: absolute;
    z-index: 9999999;
}

.progress_div {
    transition: width .5s;
}

.progress div {
    width: 0;
    height: 100%;
    background: black;
}

.about_all {
    padding: 50px 120px;
}

.Gradient_underline {
    position: relative;
}

.Gradient_underline:after {
    content: "";
    width: 0;
    height: 1px;
    background: black;
    position: absolute;
    top: 115%;
    left: 50%;
    transition: all .5s;
}

.Gradient_underline:hover:after {
    left: 0;
    width: 100%;
}

.form-control {
    border: 0;
}

.form-control:focus {
    box-shadow: 4px 4px 5px 0 #888888;
    transition: all .5s;
}

.form-control:hover {
    box-shadow: 4px 4px 5px 0 #888888;
    transition: all .5s;
}

.alarm_out {
    width: 20px;
    position: absolute;
    height: 20px;
    margin: 0 auto;
    top: 20px;
    right: 178px;
    border-radius: 50%;
    background-color: red;
    box-shadow: red 0 0 25px;
}

.alarm_in {
    width: 100%;
    height: 100%;
    background-color: #e9ecef;
    border-radius: 50%;
    box-shadow: red 0 0 20px;
    animation-name: move;
    animation-duration: 0.5s;
    animation-iteration-count: infinite;
}

@keyframes move {
    from {
        opacity: 0.5;
    }
    to {
        opacity: 0
    }
}

.alarm {
    position: absolute;
    top: 10px;
    right: 10px;
}


/* 移动端 */
@media screen and (max-width: 768px) {
    .alarm {
        display: none;
    }

    .alarm_out {
        right: 20px;
    }
}

.back_top {
    position: fixed;
    right: 10px;
    bottom: 40px;
    width: 50px;
    text-align: center;
    line-height: 1;
    overflow: hidden;
    display: none;
}

.back_bottom {
    position: fixed;
    right: 10px;
    bottom: 10px;
    width: 50px;
    text-align: center;
    line-height: 1;
    overflow: hidden;
    display: none;
}

.onselectstart {
    background-color: #e9ecef
}

.main111 {
    margin-top: 1rem;
}

.back_ico {
    font-size: 30px;
}