html, body {
    margin: 0 auto;
    /*width: 100%;
    height: 100%;*/
}

#wrap {
    height: 100%;
    position: relative;
    /*border:1px solid red;*/
}

#LT {
    position: absolute;
    top: 0;
    left: 0;
    width: calc(100vw / 3);
    height: calc(100% * 0.65);
    /*border: 1px solid midnightblue;*/
}

#MT {
    position: absolute;
    top: 0;
    left: calc(100vw / 3);
    width: calc(100vw / 3);
    height: calc(100% * 0.65);
    /*border: 1px solid blue;*/
}

#RT {
    position: absolute;
    top: 0;
    left: calc(100vw / 3 * 2);
    width: calc(100vw / 3);
    height: calc(100% * 0.65);
    /*border: 1px solid blue;*/
}

#LB {
    position: absolute;
    top: calc(100% * 0.65);
    left: 0;
    width: calc(100vw / 2);
    height: calc(100% * 0.35);
    /*border: 1px solid gray;*/
}

#RB {
    position: absolute;
    top: calc(100% * 0.65);
    left: calc(100vw / 2);
    width: calc(100vw / 2);
    height: calc(100% * 0.35);
    /*border: 1px solid Brown;*/
}