.demo-viewport {
    /*border: 2px solid red;*/
}

/*
 * =======================================================
 * left page part
 * =======================================================
 */


#selectors {
    width: 39%;
    margin-left: 45%;
    margin-right: 0;
    display: inline-block;
    padding-left: 0;
}




/*
 * =======================================================
 * center page part
 * =======================================================
 */


#source,
#destination {
    position: absolute;
    width: 100%;
    left: 0;
    top: 0;
}


.result-help {
    position: relative;
    width: 50%;
    margin: 30px auto;
}



.result-help .img-help {
    position: relative;
    display: inline-block;
    width: 48%;
}

.result-help #help1 {
    float: left;
}

.result-help #help2 {
    float: right;
}

.result-help .img-help #top-help,
.result-help .img-help #bottom-help {
    display: block;
    width: 100%;
}

.result-help .img-help #top-help {
    left: 0;
}

.result-help .img-help #bottom-help {
    right: 0;
}

.order-help {
    position: absolute;
    top: 0;
    left: 0;
    background-color: white;
    width: 60px;
    text-align: center;
}


.arrow {
    cursor: pointer;
}

/*
 * =======================================================
 * full screen
 * =======================================================
 */



.but-fs {
    width: 150px;
    left: -150px;
}

.but-fs:hover {
    transform: translateX(150px);
}

.but-fs:hover #selectors {
    margin-left: 10%;
    width: 80%;
}