body{
        font-family: Arial;
        font-size:23px;
        background-color: #EEEEEE;
        text-align: center;
        margin:0px;
        padding:0px;
    }
    #app{
        width:320px;
        height:320px;
    }
    button{
        width:320px;
        height:100px;
        margin:0;
        padding: 0px 0px;
        font-size: 25px;
    }
    h1{
        text-align: center; 
        font-size:20px;
    }
    #main{
        height:100%;
        width:320px;
        margin:0px auto;
    }
    #ad1{
        width: 320px;
        height: 100px;
        
    }
    #ad2{
        width: 320px;
        height: 100px;
        
    }
    footer{

    }