html, body{
    margin: 0;
    padding: 0;
}
body{
    color: white;
    background-color: white;
}
#voltar{
    background-color: white;
    border: 5px solid greenyellow;
    position: absolute;
    width: 106px;
    height: 45px;
    right: 40px;
    top: 20px;
    cursor: pointer;
}
#mudartema{
    background-color: white;
    border: 5px solid greenyellow;
    position: absolute;
    width: 106px;
    height: 45px;
    right: 160px;
    top: 20px;
    cursor: pointer;
}
#calculadora{
    display: inline-block;
    text-align: center;
    border: 6px solid rgb(0, 0, 0);
    border-radius: 20px;
    position: absolute;
    top: 200px;
    left: 770px;
    background-color: rgb(65, 65, 65);
    padding-right: 7px;
    padding-left: 7px;
    transition: 1s
    ;
}
#display{
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: bold;
    border: 5px solid black;
    border-radius: 20px;
    background-color: rgb(36, 36, 36);
    color: greenyellow;
    margin-top: 10px;
    width: 280px;
    word-break: break-all;
}
.botao{
    transition: 0.3s;
    width: 69px;
    height: 69px;
    border: 1.5px solid rgb(0, 0, 0);
    margin-bottom: 10.5px;
    font-size: 24px;
    font-weight: bold;
    margin-right: 2px;
    background-color: rgb(36, 36, 36);
    color: greenyellow
}
.botao:hover{
    cursor: pointer;
    transform: scale(1.1);
    transition: 0.3s;
}