It is recommend that you make a copy of an existing theme and edit it. In order to be able to edit the theme and see changes without restarting the keycloak server you need to edit the standalone.xml file on your keycloak server to disable caching.
located here
./standalone/configuration/standalone.xml
Make the following changes to standalone.
<theme>
<staticMaxAge>-1</staticMaxAge>
<cacheThemes>false</cacheThemes>
<cacheTemplates>false</cacheTemplates>
...
</theme>
To change the title for your login and register user screen you can edit the CSS located at
./raincatcher-keycloak-theme/login/resources/css/styles.css
Make changes here to change the title
/* Change content to change the title of the page*/
div#kc-header::after {
content: 'FeedHenry Work Force Management';
font-size: 40px;
line-height: 20px;
margin-bottom: 15px;
}
/*title banner size and colour*/
div#kc-container-wrapper {
width:100%;
background-color: rgb(40,53,147);
padding-top: 2.5em;
padding-bottom: 2.5em;
padding-right: 2em;
padding-left: 3em;
}
To change your background colour or set a background image
body {
background-color: rgb(63,81,181);
/*background-image: url('../img/bkgrnd.jpg');*/
background-size: cover;
background-repeat: no-repeat;
color: #fff;
font-family: sans-serif;
text-shadow: 0px 0px 10px #000;
margin: 0px;
}
To change the login and fields text
/* label change Username, Password text*/
div#kc-form label {
color: rgba(255, 255, 255, 0.7) !important;
display: block;
font-size: 30px;
}
To change the fields look and feel
/*fields*/
input[type=text], input[type=password] {
color: #ddd;
font-size: 30px;
margin-bottom: 20px;
background: none;
border-width: 0 0 1px 0;
padding: 12px;
width: 95%;
}
To change the login and register button
/*button*/
input[type=submit] {
border: none;
border-radius: 3px;
background-color: rgb(40,53,147);
box-shadow: 0px 0px 6px rgba(0,0,0,0.5);
color: rgba(0,0,0,0.6);
font-size: 30px;
color: white;
text-transform: uppercase;
padding: 20px;
margin-top: 3em;
width: 98%;
}
More information see Keycloak Themes documentation here