#app, .view {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    #header{
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        height: 50px;
        line-height: 50px;
    }
    #body{
        position: absolute;
        left: 0;
        right: 0;
        top: 50px;
        bottom: 0;
    }
}