html, body {
    height: 100%
}

body {
    margin: 0;
    padding: 0
}

iframe {
    width: 100%;
    border: none;
    margin: 0;
    padding: 0
}

.mas, .dai, .rna {
    flex: 1;
    display: flex
}

.mas {
    display: flex;
    flex-direction: column;
    height: 55px
}

.dai {
    flex-direction: row;
    height: calc(100% - 55px)
}

#F10 {
    height: 48px;
    min-height: 48px
}

#F11 {
    height: 100%;
    width: 370px;
    min-width: 370px
}

#F12 {
    height: 100%
}