.calculator {
    margin-bottom: 25px;
}

.calculator input{
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
    font-size: 16px;
    box-sizing: border-box;
}

.calculator button {
    width: 20%;
    margin-top: 10px;
    margin-bottom: 10px;
    padding: 10px;
    font-size: 16px;
    font-weight: 500;
    box-sizing: border-box;	
    height: 40px;
    cursor: pointer;
    border: none;
    border-radius: 20px;
    background-color: #fc4600;
    color: #FFF;
}

h2.calculator, h3.calculator {
    color: #000;
}