html,body {
    font-size: 100%;
    width: 100%;
    height: 100%;
    -webkit-user-select: none;
    display: -webkit-flex;
}
body > div {
    flex: 1;
    margin: 0 15px;
}

.control {
    display: inline-block;
    /*margin: 10px auto;*/
    height: 200px;
    vertical-align: top;
}
.control select {
    height: 100%;
}
.control button {
    vertical-align: top;
    height: 25px;
    width: 50px;
    margin: 5px;
}
.control .status {
    display: block;
    margin: 10px 0;
    /*line-height: 30px;*/
}

#devices {
    box-sizing: border-box;
    width: 200px;
    padding: 2px;
    text-align: center;
    font-size: .8rem;
}

#drop {
    display: inline-block;
    box-sizing: border-box;
    border: 3px dashed gray;
    width: 200px;
    height: 200px;
}
#drop:hover, #drop.hover {
    border-color: red;
}

#log {}
#log p {
    margin: .5rem 0;
    font-size: .8rem;
}