gistfile1.css

body {
   background-color: #bada55;
    min-width: 190px;
   
}

input[type='button'] {
    width: 45px;
    height: 45px;
    margin: 1px;
}

#ans{
    width: 183px;
    height: 45px;
    font-size: 30px;
}