body {
    background-color: lightgreen;
    margin: 0px 100px;
}

.err {
    color: darkred;
    visibility: hidden;
}

#main {
    background-color: white;
    padding: 1em 5em 3em 5em;
}

h1 {
    color: darkgreen;
    font-size: 200%;
}

fieldset {
    border: solid 1px darkgreen;
    padding: 1em;
}

legend {
    color: darkgreen;
    font-variant: small-caps;
}

.btn {
    background-color: darkgreen;
    border-color: darkgreen;
}

/* The message box is shown when the user clicks on the password field */
#message {
    display:none;
    background: #f1f1f1;
    color: #000;
    position: relative;
    padding: 20px;
    margin-top: 10px;
}

#message p {
    padding: 10px 35px;
    font-size: 18px;
}

/* Add a green text color and a checkmark when the requirements are right */
.valid {
    color: green;
}

.valid:before {
    position: relative;
    left: -35px;
    content: "✔";
}

/* Add a red text color and an "x" icon when the requirements are wrong */
.invalid {
    color: red;
}

.invalid:before {
    position: relative;
    left: -35px;
    content: "✖";
}