uninstall reshade code example

Example 1: how completely remove kde

sudo apt-get remove plasma-desktop
sudo apt-get autoremove

Example 2: how to remove white space under footer

html,
body {
 height: 100%;
 position: relative;
}
.site-content {
 min-height: 100vh; /* will cover the 100% of viewport */
 overflow: hidden;
 display: block;
 position: relative;
 padding-bottom: 100px; /* height of your footer */
}
footer {
 position: absolute;
 bottom: 0;
 width: 100%;
}