style.css

*{
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}
.fundo{
    background-image: linear-gradient(to right top, #b5b9c0, #a0afd8, #98a0ec, #a18df8, #b971fb);;
    height: 100vh;
    text-align: center;
    color: aliceblue;
}
#result{
    width: 207px;
    background-color: azure;
    height: 30px;
    margin: 5px;
    border-radius: 2px;
    color: black;
    text-align: right;
}
.calculator-body{
    position: absolute; /*vai ocupar só o espaço dela */
    background-color: rgb(65, 105, 225, 0.7);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 10px;
    border-radius: 5px;
}
button{
    border-radius: 5px;
    border-style:hidden;
    border: 5px;
    width: 50px;
    height: 50px;
    font-size: 20px;
    cursor: pointer;
    background-color:rgb(181, 194, 231, 0.6) ;
    border: none;
    color: rgb(51, 51, 51);
    
}
button:hover{
    background-color:#7c9bf1;
}