.frame{
    background:#000000;
    border:1px solid;
    margin-top:10em;
    margin-left:40em;
    height:700px;
    width: 500px;
    padding-top:30px;
}

#screen{
    background-color: #2E2E2E;
    width:80%;
    height:100%;
    margin-left:45px;
    cursor:default;
    -webkit-user-select:none;
    -moz-user-select:none;
    -ms-user-select:none;
    user-select: none;
    color:white;
    font-size:50px;
    font-weight: bold;;

    

}
.screen:focus{
    border:0;
    outline:none
}

.buttons{
    margin-left:45px;
    box-sizing:border-box;
    font-weight:bold;
    
}
button{
    width:100px;
    height:100px;
    font-size:xx-large;
    background-color: #505050;
    color:white;
    border-radius:100px;
    border:1px;
}

.row{
    margin-top:15px
}
.screenSection{
    height:100px;
}
.operator{
    background-color: #FF9500;
    color:white;
}