body {
    background-image: url(flower.jpg);
    background-size: cover;
}

h1, h2, p {
    text-align: left;
    margin: 0 auto;
    color: #425B79;
}

h1 {
    position: relative;
    font-family: 'Anton',
    sans-serif;
    letter-spacing: 1.5px;
}

h2 {
    text-align: right;
    font-family: 'Marck Script', cursive;
}

p {
    padding-top: 5px;
    font-family: 'Marck Script', cursive;
}

.calculator {
    text-align: center;
    margin: 100px auto;
    width: 320px;
    height: 500px;
    font-family: 'Anton',
    sans-serif;
    background-color: #D9DEE2;
    border-radius: 10px;
    -webkit-box-shadow: 5px 5px 25px -5px rgba(0, 0, 0, 0.75);
    -moz-box-shadow: 5px 5px 25px -5px rgba(0, 0, 0, 0.75);
    box-shadow: 5px 5px 25px -5px rgba(0, 0, 0, 0.75);
}

.calculator-screen {
    height: 100px;
    border-radius: 10px;
    padding: 0 20px;
    box-sizing: border-box;
    font-size: 45px;
    border: none;
    width: 100%;
    background-color: #D9DEE2;
    color: #445B77;
    text-align: right;
    font-weight: bold;
}

.calculator-keys {
    margin: 0 auto;
    width: 100%;
}

.row {
    display: flex;
    width: 320px;
}

button {
    border-radius: 50%;
    height: 50px;
    width: 50px;
    margin: 15px;
    background-color: #E2C0A3;
    border-width: 0;
    font-size: 25px;
    font-weight: bold;
    color: #445B77;
    outline: none;
}

.operator, .equal-sign {
    background-color: #445B77;
    color: #E2C0A3;
}

button:hover,
.operator:hover,
.equal-sign:hover {
    background-color: #BCA57D;
    color: #445B77;
    cursor: pointer;
}

button:active,
.operator:active,
.equal-sign:active {
    font-size: 20px;
    position: relative;
    top:5px;
}