style.css

*{
    margin: 0;
    padding: 0;
    background-color: blanchedalmond;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
#heading{
    margin-top: 50px;
    color: cadetblue;
    text-align: center;
}
.calculator{
    border: 2px solid brown;
    border-radius: 10px;
    margin: 12px;
    padding: 15px;
    width: 380px;
    height: 170px;
    align-items:start;
    margin-top: 30px;
    margin-left: 560px;
}
.calculator label{
    color: chocolate;
    font-size: 20px;
    font-weight: 500;
}
input{
    color: black;
    background-color:rgb(138, 165, 181);
    font-size: 13px;
    padding: 3px;
    border: 2px solid rgb(43, 56, 27);
    border-radius: 4px;
}
.calculator button{
    font-size: 18px;
    font-weight: 300;
    text-align: center;
    margin: 7px;
    padding: 7px;
    color: rgb(40, 69, 124);
    background-color: darkgray;
    border: 1px solid darkgray;
    border-radius: 10px;
    margin-left: 85px;
}
#output{
    margin-top: 50px;
    color: cadetblue;
    text-align: center;
}
.outputBox{
    border: 2px solid brown;
    border-radius: 10px;
    margin: 12px;
    padding: 15px;
    width: 380px;
    height: 170px;
    align-items:start;
    margin-top: 30px;
    margin-left: 560px;
}
#finalAmount0{
    font-size: 18px;
    font-weight: 400;
    margin-top: 30px;
    margin-left: 15px;
    color: rgb(86, 13, 27);
}
#finalAmount1{
    font-size: 18px;
    font-weight: 400;
    margin-top: 20px;
    margin-left: 15px;
    color: rgb(86, 13, 27);
}
#finalAmount2{
    font-size: 18px;
    font-weight: 400;
    margin-top: 20px;
    margin-left: 15px;
    color: rgb(86, 13, 27);
}