* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
    font-family:  Arial, Helvetica, sans-serif;
}
.flex-between{
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.flex-center{
    display: flex;
    justify-content: center;
    align-items: center;
}
.flex-end-center{
    display: flex;
    justify-content: center;
    align-items: flex-end;
}
.flex-end-between{
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}
.flex-start-between{
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}
.flex-start{
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.flex-around{
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
}
.flex-start-center{
    display: flex;
    justify-content: center;
    align-items: flex-start;
}
.flex-end-center{
    display: flex;
    justify-content: center;
    align-items: flex-end;
}
.flex-column-center{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}
.flex-column-start{
    display: flex;
    justify-content: center;
    align-items: start;
    flex-direction: column;
}
a{
    text-decoration: none;
}
.contact-detail-box{
    background: #FFFFFF;
    box-shadow: 0px 0px 10px 0px rgba(120,120,128,0.2);
    border-radius: 12px;
    position: absolute;
    display: none;

    font-weight: 400;
    font-size: 20px;
    color: #1C1C1E;
    font-style: normal;
    text-align: center;
}
.contact-email{
    top: 73px;
    right: 122px;
    width: 321px;
    height: 67px;
    line-height: 67px;
}
.contact-wechat{
    top: 73px;
    right: 30px;
    padding: 5px;
}
.contact-mark{
    width: 100%;
    height: 100%;
    background-color: rgba(120,120,128,0.2);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
    cursor: pointer;
}
.home-icon{
    width: 36px;
    margin-right: 12px;
    cursor: pointer;
}
.language-icon{
    margin-right: 60px;
}
/* 4k屏幕 */
@media screen and (min-width: 3840px) {
    .home-icon{
        width: 66px;
    }
}
/* 2k屏幕 */
@media screen and (min-width: 2048px) and (max-width: 3839px) {
    .home-icon{
        width: 46px;
    }
}
/* 720P */
@media screen and (min-width: 1280px) and (max-width: 1499px) {
}
/* pad适配 */
@media screen and (min-width: 768px) and (max-width: 1279px) {
}
/* 移动端适配 */
@media screen and (max-width: 768px) {
    .home-icon{
        width: 26px;
    }
    .contact-email{
        top: 60px;
        right: 12px;
    }
    .contact-wechat{
        top: 60px;
        right: 12px;
    }
}