*{
    margin: 1;
    padding: 0;
}

h2{
    text-align: center;
    
}

h3{
    text-align: center;
    color: rgb(7, 17, 127);
}

.calculator{
    margin: 0 auto;
    width: 335px;
    height: 200px;
    text-align: center;
    margin-top: 20px;
    box-shadow: 0 2px 4px 0 rgba(216, 5, 5, 0);
    transition: 0.3s;
    font-size: 0;
}

.display-box{
    border-radius: 15px;
    font-family: Comic Sans MS;
    background-color: rgb(188, 194, 194);
    width: 254px;
    height: 75px;
    font-size: 16px;
    font-weight: bold;
    color: black;
    text-align: right;
    padding: 0 3px;
    letter-spacing: 2px;
}

.button{
    border-radius: 15px;
    width: 87px;
    height: 80px;
    font-size: 16px;
    background-color: #1f2326;
    font-family: Comic Sans MS;
    color: rgb(255, 255, 255);
}
 
.button:hover{
    background-color: rgb(2, 89, 212);
}