styles.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.calculator{
    display: flex;
    justify-content: center;
    flex-direction: column;
    margin-top:20vh;
    background: rgb(51, 129, 124);
    margin-left: 10px;
    margin-right: 10px;
}
.calculator-keys{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr ;
    gap: 3px;
    margin: 10px;
}
.calculator-display{
    font-weight: bold;
    mix-blend-mode: screen;
    color: #ffffff;
    height: 30px;
    text-align: end;
    padding: 20px;
    font-size: 1.3rem;
}
button{
    background-color: #eee;
    border: none;
    padding: 10px;
    
}
button#decImal{
    font-weight: bold;
}
.pressed{
    background-color: darkblue;
    color: #ffffff;
}
h1{
    color: rgb(51, 129, 124);
    text-align: center;
    text-transform: uppercase;
    font-size: 1.8rem;
}

p {
    text-align: center;
}


@media(min-width: 900px){
    .calculator-keys{
    height: 49vh;
    }
    .calculator-display{
        height: 60px;
        text-align: end;
        padding: 20px;
        font-size: 1.9rem;
    }
    .pressed{
        background-color: black;
        color: white;
    }
    p{
        color: #ffffff;
        padding: 10px;
    }
    button{
        font-size: 1.3rem;
    }
    body{
        background: url('./back.gif');
        background-position: center;
        background-repeat: no-repeat;
        background-size: 110%;
    }
}