.header_box {
    height: 80px;
    background: #FFFFFF;
    border-bottom: 1px solid #EEEEEE;    
}

.a_btn {
    cursor: pointer;
    display: inline-block;
    line-height: 80px;
    height:80px;
    text-decoration: none;
    color: #666666;
    letter-spacing: 0;
    font-weight: 400;
    border:none;
}
.active_a_btn {
    cursor: pointer;
    display: inline-block;
    text-decoration: none;
    letter-spacing: 0;
    font-weight: 400;
    color: #4B7FFF !important;
    height: 78px !important;
    border-bottom: 2px solid #4B7FFF !important;
}

.a_btn:hover {
    color: #4B7FFF;
    height: 78px;
    border-bottom: 2px solid #4B7FFF;
}