custom.css

.container {
width: 710px;
}

body {
background: #cff;
}

header {
padding-top: 20px;
}

header img {
padding: 1em;
background: #fff;
}

section {
margin-top: 1em;
font-size: 120%;
padding: 20px;
background: #fff;
}

section h1 {
font-size: 200%;
}

/* Links */

a {
color: #09c;
text-decoration: none;
}

a:hover {
color: #069;
text-decoration: underline;
}

a:visited {
color: #069;
}

/* Navigation */
nav {
float: right;
}

nav {
background-color: white;
padding: 0 0.7em;
white-space: nowrap;
}

nav ul {
margin: 0;
padding: 0;
}

nav ul li {
list-style-type: none;
display: inline-block;
padding: 0.2em 0;
}

nav ul li a {
padding: 0 5px; 
font-weight: bold;
}

nav ul li a:visited {
color:#09c;
}

nav ul li a:hover {
text-decoration: underline;
}

/* sign up button */
a.signup_button {
margin-left: auto;
margin-right: auto;
display: block;
text-align: center;
width: 190px;
color: #fff;
background: #006400;
font-size: 150%;
font-weight: bold;
padding: 20px;
}

.round {
-moz-border-radius: 10px;
-webkit-border-radius: 10px;
border-radius: 10px;
}

footer {
text-align: center;
margin-top: 10px;
width: 710px;
margin-left: auto;
margin-right: auto;
}

footer nav {
float: none;
}

/* user show page */

table.profile {
width: 100%;
margin-bottom: 0;
}

td.main {
width: 70%;
padding: 1em;
}

td.sidebar {
width: 30%;
padding: 1em;
vertical-align: top;
background: #ffc;
}

.profile img.gravatar {
border: 1px solid #999;
margin-bottom: -15px;
}

div.field, div.actions {
margin-bottom: 10px;
}
.field_with_errors {
margin-top: 10px;
padding: 2px;
background-color: red;
display: table;
}

.field_with_errors label {
color: #fff;
}

#error_explanation {
width: 400px;
border: 2px solid red;
padding: 7px;
padding-bottom: 12px;
margin-bottom: 20px;
background-color: #f0f0f0;
}

#error_explanation h2 {
text-align: left;
font-weight: bold;
padding: 5px 5px 5px 15px;
font-size: 12px;
margin: -7px;
background-color: #c00;
color: #fff;
}

#error_explanation p {
color: #333;
margin-bottom: 0;
padding: 5px;
}

#error_explanation ul li {
font-size: 12px;
list-style: square;
}