a,
a:focus,
a:hover {
    color: #fff;
}

.btn-default,
.btn-default:hover,
.btn-default:focus {
    color: #333;
    text-shadow: none;
    /* Prevent inheritance from `body` */
    background-color: #fff;
    border: 1px solid #fff;
}

html {
    height: 100%;
    font-size: 16px;
    font-weight: 300;
}

body {
    font-family: 'Open Sans', 'Microsoft YaHei';
    height: 100%;
    color: #fff;
    text-align: center;
    text-shadow: 0 1px 3px rgba(0, 0, 0, .5);
}

.site-wrapper {
    display: table;
    width: 100%;
    height: 100%;
    min-height: 100%;
    -webkit-box-shadow: inset 0 0 100px rgba(0, 0, 0, .5);
    box-shadow: inset 0 0 100px rgba(0, 0, 0, .5);
}

.site-wrapper-inner {
    display: table-cell;
    vertical-align: middle;
}

.cover-container {
    width: 100%;
    margin-right: auto;
    margin-left: auto;
}

.inner {
    padding: 30px;
}

@media (min-width: 992px) {
    .cover-container {
        width: 700px;
    }
}

@keyframes bga {
    0% {
        top: 100%;
        transform: translateY(0);
    }
    100% {
        top: -100px;
        transform: rotate(-600deg);
    }
}

.bg {
    background: linear-gradient(to bottom right, #437bb3, #b2437b);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.bg div {
    position: absolute;
    top: 100%;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.15);
    animation: bga 20s linear infinite;
}

.bg div:nth-child(1) {
    left: 10%;
}

.bg div:nth-child(2) {
    left: 20%;
    width: 80px;
    height: 80px;
    animation-delay: 2s;
    animation-duration: 17s;
}

.bg div:nth-child(3) {
    left: 25%;
    animation-delay: 4s;
}

.bg div:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 60px;
    animation-duration: 22s;
    background-color: rgba(255, 255, 255, 0.25);
}

.bg div:nth-child(5) {
    left: 70%;
}

.bg div:nth-child(6) {
    left: 80%;
    width: 70px;
    height: 70px;
    animation-delay: 3s;
    background-color: rgba(255, 255, 255, 0.2);
}

.bg div:nth-child(7) {
    left: 32%;
    width: 100px;
    height: 100px;
    animation-delay: 7s;
}

.bg div:nth-child(8) {
    left: 55%;
    width: 40px;
    height: 40px;
    animation-delay: 15s;
    animation-duration: 40s;
}

.bg div:nth-child(9) {
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 2s;
    animation-duration: 40s;
    background-color: rgba(255, 255, 255, 0.3);
}

.bg div:nth-child(10) {
    left: 90%;
    width: 60px;
    height: 60px;
    animation-delay: 11s;
}