Are there many people who, like me, think that WordPress's default backend login page is too ugly? As someone with obsessive-compulsive tendencies, I naturally couldn't stand it, so I searched everywhere for plugins to modify the backend login page.

Later, I thought that using a plugin just to modify one page might be overkill, so I decided to use CSS to modify the layout of the backend login page. Without further ado, here's the code.

Demo Image

CSS Code

body, textarea {
    font-size: 14px;
    font-family: "Microsoft Yahei", Arial, sans-serif !important;
}
input {
    font-size: 14px;
    font-family: Tahoma, Arial, sans-serif !important;
}
body {
    background: #92C1D1 url(背景图片url) fixed center top no-repeat !important;
}
.login h1 a {
    background-image: url('LOGO图片url') !important;
    background-size: 170px 35px;
    background-position: top center;
    background-repeat: no-repeat;
    width: 170px;
    margin: auto;
    margin-top: 35px;
    height: 35px;
    text-indent: -9999px;
    overflow: hidden;
    padding-bottom: 15px;
    display: block;
}
#login {
    width: 320px;
    background: rgba(0, 0, 0, 0.2);
    padding: 0 20px 100% 12px;
    margin: auto;
    top: 0px;
    right: 15%;
    position: fixed;
    box-shadow: 0px 0px 5px 0px #333;
}
.login form {
    margin-left: 8px;
    padding: 26px 24px 46px;
    font-weight: normal;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: #000 0 0px 10px -1px;
}
#loginform {
    -webkit-border-radius: 0px;
    border-radius: 0px;
}
.login form .input, .login input[type="text"] {
    color: #555;
    font-weight: 200;
    font-size: 24px;
    line-height: 1;
    width: 100%;
    padding: 5px;
    margin-top: 2px;
    margin-right: 6px;
    margin-bottom: 16px;
    border: 1px solid #FFF;
    background: #FFF !important;
    outline: 0;
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;
}
.login form .input, .login input[type="text"] {
    font-size: 17px;
    padding-bottom: 11px;
    padding-top: 11px;
    text-indent: 3px;
}
.login form .input, .login input[type="text"] {
    border: 2px solid #DCE4EC;
}
input.button-primary {
    margin-top: 8px;
    border: #000;
    font-weight: bold;
    text-shadow: #FFF 0 0px 10px;
}
.login .button-primary {
    font-size: 14px !important;
    line-height: 22px;
    padding: 8px 117px;
    border-radius: 0px;
}
input.button-primary {
    background: rgba(255, 255, 255, 0.5);
    color: #000;
}
input.button-primary:hover, input.button-primary:focus {
    background: rgba(255, 255, 255, 0.8);
    color: #000;
}
input.button-primary:active {
    background: rgba(255, 255, 255, 0.2);
    color: #000;
}
.login form .forgetmenot {
    font-weight: normal;
    float: none;
    margin-top: -10px;
}
.login #nav, .login #backtoblog {
    text-shadow: #FFF 0 0 5px, #FFF 0 0 10px;
    float: right;
    margin: 0 30px 0 0px;
    padding: 16px 0px 0 20px;
}
.login #nav a, .login #backtoblog a {
    color: #FFF !important;
}
.login #nav a:hover, .login #backtoblog a:hover {
    color: #000 !important;
}
div.error, .login #login_error {
    display: none;
}
div.updated, .login .message {
    background-color: #E0FFE1;
    border-color: #ACE655;
}

How to Use

Write the CSS code above into a xinadmin.css file and upload it to the css folder in the theme directory.

Add the following code to the theme's functions.php file:

// 自定义登录页面
function custom_login_logo() { 
    echo '<link rel="stylesheet" id="wp-admin-css" href="' . get_bloginfo('template_directory') . '/css/xinadmin.css" type="text/css" />';
}
add_action('login_head', 'custom_login_logo');

And that's it! Remember to replace the image URL addresses in the CSS code!