body {
    max-width: 900px;
   margin: 0 auto;
}

p {
    max-width: 900px;
    margin: 0 auto;
}
header {
    background-color: rgb(8, 8, 8);
    padding: 28px;
    border-top-right-radius: 20px;
    border-top-left-radius: 20px;
    border-bottom: 2px solid lightgray;
}
h1 {
    font-family: 'Courier New', Courier, monospace;
    font-size: 4em;
    color:greenyellow;
    text-align: center;
}
.inputCnt {
    display: flex;
    justify-content: space-evenly;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    color:greenyellow;
}
input:focus, 
textarea:focus {
    background-color: greenyellow;
}
label {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    color:greenyellow;
}
#primeiroNumero, #segundoNumero {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    color:black;
    width: 10%;
    height: 10%;
}
#btnCalcular{
    font-family: 'Courier New', Courier, monospace;
    background-color: greenyellow;
    font-size: 1em;
    border-radius: 50px;
   }
main{
    background-color: rgb(66, 66, 65);
    display: flex;
}
.calculoCnt{
    border: 1px solid black;
    text-align: center;
    width: 100%;
    padding: 10px;
}
.calculoNome {
    color: rgb(104, 133, 172);
    font-size: 2em;
    text-align: center;
}
.resultado{
    color: white;
    font-size: 3em;
    text-align: center;
}
footer{
    font-family: 'Courier New', Courier, monospace;
    padding: 100px;
    text-align: right;
}