* {
    margin: 0;
    padding: 0;
    text-decoration: none;
}

body {
    background: #ecf0f1;
}

/*内容居中*/

.container-center {
    width: 100%;
    text-align: center;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

@media (max-width: 768px) {
    .btn-block {
        display: inline-block;
        margin: 10px;
    }
}

/*模态窗体阴影部分*/

.content {
    width: 100%;
    height: 100%;
    display: none;
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0.55);
    z-index: 5;
}

/*模态窗体*/

.operating {
    display: none;
    overflow: hidden;
    background: #ecf0f1;
    border-radius: 10px;
    transition: 0.5s;
}

/*底部*/

.footer {
    width: 100%;
    text-align: center;
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translate(-50%, -50%);
}

/*文件发送样式*/

.load-container {
    width: 60px;
    height: 60px;
    background-color: #00adb5;
    margin: 50px auto;
    -webkit-animation: rotateplane 1.2s infinite ease-in-out;
    animation: rotateplane 1.2s infinite ease-in-out;
}

@-webkit-keyframes rotateplane {
    0% {
        -webkit-transform: perspective(120px)
    }
    50% {
        -webkit-transform: perspective(120px) rotateY(180deg)
    }
    100% {
        -webkit-transform: perspective(120px) rotateY(180deg) rotateX(180deg)
    }
}

@keyframes rotateplane {
    0% {
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg)
    }
    50% {
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
        -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg)
    }
    100% {
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}

/* 加载条 */

.load {
    display: none;
    width: 80%;
    height: 20px;
    margin: 10px auto;
    border-radius: 4px;
    background-color: #f7f7f7;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    background-image: linear-gradient(to bottom, #f5f5f5, #f9f9f9);
}

.load-bar {
    height: 100%;
    background-size: 40px 40px;
    background-color: #149bdf;
    background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
}

/*文件接收样式*/

.password-receive {
    width: 80%;
    height: 40px;
    margin: 50px auto;
    border-radius: 40px;
    box-shadow: 0 0 12px 0 rgba(0, 0, 0, .2);
}

.password-receive input {
    width: 80%;
    height: 40px;
    font-size: 20px;
    padding: 0 10%;
    border: none;
    outline: none;
    border-radius: 40px;
}

/* 公告 */

.bulletin {
    width: 300px;
    height: 300px;
}

.bulletin h3 {
    color: #f00;
    margin: 10px auto;
}