.theme-btn {
    display: inline-block;
    border-radius: 4px;
    font-size: 14px;
    line-height: 1.5;
    font-weight: 500;
    color: #000000;
    background: #fff;
    background-size: 200% auto;
    border: 1px solid var(--system_primery_color);
    padding: 12px;
    text-align: center;
} .course_fullview_wrapper {
    top: var(--top);
    height: 500px;
    min-height: calc(100vh - var(--top) - 1px);
    padding-left: 40px;
    padding-right: 40px;
}