html {
    height: 100%
}

body {
    margin: 0;
    min-height: 100%;
    background-color: #ffffff;
    background-size: 100% 100%;
}

.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.contain {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.stretch {
    display: block;
    width: 100%;
    height: 100%;
}

.cover {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bottom {
    position: absolute;
    bottom: 0;
    left: 50%;
    -ms-transform: translate(-50%, 0);
    transform: translate(-50%, 0);
}

.bottomLeft {
    position: absolute;
    bottom: 0;
    left: 0;
}

.bottomRight {
    position: absolute;
    bottom: 0;
    right: 0;

}

.loader {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 96px auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Loading动画样式 */
.loading {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 5px solid #ccc;
    border-top-color: #666;
    animation: spin 1s linear infinite;
}

.loading-tips {
    margin-top: 12px;
    font-size: 14px;
    color: #666;
    text-align: center;
    position: relative;
}

/* Loading动画旋转动画 */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}