* {
    margin: 0;
    padding: 0;
    outline: 0;
    font-family: Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif
}

a {
    text-decoration: none;
    display: block;
}

.constraint-width {
    margin: auto;
    width: 1200px;
}

input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.medium {
    flex: 1;
    min-height: 608px;
    background: #FFFFFF;
    border: 1px solid #E9E9E9;
    border-radius: 8px;
    margin-left: 30px;
}

.medium-header {
    display: flex;
    align-items: center;
    background: #F5F5F5;
    border-radius: 8px 8px 0 0;
    font-size: 20px;
    font-weight: bold;
    color: #333333;
    line-height: 56px;
    padding-left: 20px;
}

.page {
    margin-top: 50px;
    margin-right: 20px;
    display: flex;
    justify-content: flex-end;
}

.page span {
    display: inline-block;
    height: 40px;
    line-height: 40px;
    background: #F5F5F5;
    font-size: 14px;
    color: #333333;
    text-align: center;
    margin-left: 10px;
    cursor: pointer;
}

.page span.invalid {
    color: #999999;
}

.page span.active {
    background: #C71717;
    color: #FFFEFE;
}

.page .num {
    width: 40px;
}

.page .pre, .page .next {
    width: 90px;
}