.header_nav {
    position: fixed;
    width: 100vw;
    background-color: #51C3D5;
    top: 0;
    left: 0;
    z-index: 99999;
}
/* 标题 */
.header_nav_title {
    position: absolute;
    display: flex;
    width: 100%;
    font-size: 28rpx;
    align-items: center;
    justify-content: center;
    color: #ffffff;
}
/* 左侧账号选择 */
.header_user_choice{
    display: flex;
    position: absolute;
    font-size: 26rpx;
    left: 30rpx;
}

.header_user_choice>view{
    max-width: 230rpx;
}