CSS

/* -- Background image -- */
body {
    background-image: url(assets/wood.png);
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* -- Center element -- */
.center {
    max-width: 60%;
    max-height: 80%;
    width: 30%;
    height: 40%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 15%;
    box-shadow: 2px 2px 4px 3px #505050;
    position: absolute;
    z-index: 1;
}

/* -- Logo style -- */
#logo {
    position: relative;
    z-index: 2;
    max-width: 100%;
    height: auto;
}

/* -- Form styles -- */
form.login {
    max-width: 100%;
    height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 2;
}

#password {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-bottom: 5%;
}

/* -- Show password -- */
#eye {
    height: auto;
    max-width: 15%;
    margin-right: 3%;
}

/* -- Login element -- */
form.login p {
    font-family: Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Georgia, serif;
    font-size: 2vw;
    max-width: 100%;
    height: auto;
    line-height: 2%;
}

form.login input[type=password] {
    max-width: 100%;
    width: 100%;
    height: auto;
}