body{
    text-align: center;
    background: linear-gradient(bisque,white);
}
h1{
    font-size: 50px;
    font-weight: bold;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

#screen-el{
    width: 380px;
    height: 70px;
    border: 3px solid black ;
    border-radius: 20px;
    margin: 10px auto;
    font-size: 30px;
    padding: 0px 20px;
}

div{
    background: grey;
    margin: 40px auto;
    padding: 20px;
    width: 470px;
    border: 3px solid black;
    border-radius: 30px;
}

button{
    font-size: 40px;
    width: 85px;
    margin: 10px ;
    padding: 10px 20px;
    border-radius: 20px;
    border: 3px solid black;
    font-family: inherit;
    font-weight: inherit;
}

button:hover{
    cursor: pointer;
}

.clear-btn{
    width: 200px;
    font-family: inherit;
    font-weight: inherit;
}