* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

body{
    background-color: #141414;
    color: #fff;
}

main {
    position: absolute;
    width: 100%;
    height: 100%;
}

.caixa {
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

form {
    border-radius: 10px;
    padding: 3%;
    border: 2px solid #a4a4a4;
}