*{
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    box-sizing: border-box;
}

.container{
    width: 100%;
    height: 100vh;
    background: #e3f9ff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator{
    background: #3a4452;
    padding: 20px;
    border-radius: 10px;
}

.calculator form input{
    border: 0;
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    box-shadow: -5px -5px 25px rgba(225, 225, 225, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
    background: transparent;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    margin: 4px;
}

form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}

form .display input{
    text-align: right;
    flex: 1;
    font-size: 45px;
    box-shadow: none;
    border-radius: 2px;
}

form input.equal{
    width: 135px;
    border-radius: 30px;
}

form input.operator1{
    background: #f4f4f4;
    color: #000;
}
form input.operator2{
    background: coral;
    color: #fff;
}
form input.operator3{
    background: #fff;
    color: #000;
}

@media (max-width: 420px) {
    .calculator{
        background: #3a4452;
        padding: 10px;
        border-radius: 10px;
    }
    .calculator form input{
        border: 0;
        outline: 0;
        width: 45px;
        height: 45px;
        border-radius: 50%;
        box-shadow: -5px -5px 25px rgba(225, 225, 225, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
        background: transparent;
        font-size: 15px;
        color: #fff;
        cursor: pointer;
        margin: 4px;
    }
    
    form .display input{
        text-align: right;
        flex: 1;
        font-size: 35px;
        box-shadow: none;
        border-radius: 2px;
    }
    form input.equal{
        width: 103px;
        border-radius: 30px;
    }
    
    form input.operator1{
        background: #f4f4f4;
        color: #000;
    }
    form input.operator2{
        background: coral;
        color: #fff;
    }
    form input.operator3{
        background: #fff;
        color: #000;
    }
  
    
    
}
@media (max-width: 300px) {
    .calculator{
        background: #3a4452;
        padding: 10px;
        border-radius: 10px;
    }
    .calculator form input{
        border: 0;
        outline: 0;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        box-shadow: -5px -5px 25px rgba(225, 225, 225, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
        background: transparent;
        font-size: 13px;
        color: #fff;
        cursor: pointer;
        margin: 4px;
    }

    form .display input{
        text-align: right;
        flex: 1;
        font-size: 25px;
        border-radius: 2px;
        box-shadow: none;
    }
    form input.equal{
        width: 92px;
        border-radius: 30px;
    }
    
    form input.operator1{
        background: #f4f4f4;
        color: #000;
    }
    form input.operator2{
        background: coral;
        color: #fff;
    }
    form input.operator3{
        background: #fff;
        color: #000;
    }
    
    
}