Remove the Blue Box from the Logo in the Clarion Template
The Clarion template from RocketTheme uses a colour square behind the logo to make the C a blue colour. When you change the logo, the blue square remains in the background. You can remove the square by adding the following code to template.css in the templates/rt_clarion/css folder in Joomla:
/* Remove blue box from logo. */
span#logo-color {display: none}