.header .logo {

    width:164px;
    height:182px;
    border-bottom-left-radius:17px;
    border-bottom-right-radius:17px;
    background-color:rgba(255,255,255,1.0);
    box-shadow:0px 0px 40px rgba(0,0,0,0.50);
    position:absolute;
    top:0;
    left:0;
    right:0;
    margin-left:auto;
    margin-right:auto;
    background-image:url('./files/elements/gtproduction_logo.svg');
    background-size:95px auto;
    background-position:center center;
    background-repeat:no-repeat;

}

.header .side_menu_holder {

    width:calc((100% / 2) - (164px / 2));

}