html, body {
    height: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

h1 {
    background-color: black;
    color: gold;
    font-size: 25px;
    text-align: center;
}

input {
    width: 300px;
    height: 20px;
}

button {
    background-color: gold;
    width: 300px;
    height: 20px;
    border-radius: 10px;
}

.pagina-login {
    background-color: yellow;
    min-width: 300px;
    min-height: 300px;
    float: right;
}

.pop-up {
    background-color: red;
    min-width: 300px;
    min-height: 300px;
    float: left;
}