html {}

body {
    margin: 0;
    padding: 0;
}

div {
    /* padding: 5px; */
    /* border: 1px solid red; */
}

#options {
    width: 24%;
    float: left;
    /* height: 95%; */
    /* overflow-y: auto; */
    overflow-x: hidden;
    position: absolute;
}

#reference {
    margin-left: 25%;
    /* margin-right: 10px; */
    float: left;
    width: 75%;
}