Your branded careers portal contains your logo and has a colour theme which you can customise.
First, head to 'Edit Company' under the 'Company' section.
From here you can click 'Choose a File' in the 'Logo' section, then select an image file on your computer. You should add both a dark logo and a light logo.
File formats supported are .svg, .png and .jpg:
You can edit the theme colours which appear on your branded careers portal by clicking the area shown below and selecting the colour of your choosing. You can also amend the colour ID if you know it: