.header_open_btn {
    width: 56px;
    height: 56px;
    position: fixed;
    top: 10px;
    left: 2%;   
    z-index: 300;
    cursor: pointer;
    
    display: none;
}

.header_open_btn_icon {
    width: 100%;
    height: 100%;
}

@media screen and (max-width: 706px) {
    .header_open_btn {
        display: block;
    }
}