.ddajaxsidepanel{ /* Main Panel Container */
position: fixed; /* keep this value as is */
top: 0; /* keep this value as is */
background: Black;
box-sizing: border-box;
}

.ddajaxsidepanel .panelhandle{ /* CSS for Panel Handle DIV */
width: 24px;
height: 100%;
position: absolute;
left: -14px;
top: 0;
cursor: pointer;
background: transparent url(handle.gif) center left no-repeat; /* path to "handle" gif */
}

.ddajaxsidepanel .contentarea{ /* CSS for main content area DIV */
height: 100%;
padding: 10px;
overflow: auto;
}