column background color

I am using your column, I would like to set background of one of the column. For example I am using the 3/4,1/4 type of column, now I want :

1) the 1/4 column to have some background how can I do? which code can I use
2) or to have surrounding nice dotted line with background

Please provide a link toy your site

https://www.mpe.ac.tz/courses/short-courses/sample-course-page/#overview

I would like the 1/4 of your right where you see small links to have:

1) the 1/4 column to have some background how can I do? which code can I use
2) or to have surrounding nice dotted line with background

If you are not using a child theme click the ‘Help’ button on the top right hand side of the admin screen and follow the instructions to download a child theme… then in the child theme css add:

.one-fourth {
background-color: #000000;
}

edit the 000000 to the color you want

For dotted lines

.one-fourth {
border: 1px dotted #ff6600;
width: 22.2%;
}

can I be able to make look as https://www.mpe.ac.tz/wp-content/uploads/2014/02/lines.png

please help
thanks

That image is completely different from your question. Anyway something like this should help

.one-fourth a {
display: block;
width: 100%;
border-bottom: 1px dotted #000;
font-weight: bold;
}

.one-fourth a:hover {
color: #871236;
}

.one-fourth a:hover:before {
content: '';
	width: 10px;
	height: 0;
	border-top: 5px solid transparent;
	border-bottom: 5px solid transparent;

	border-left: 5px solid #871236;
margin-left: -15px;
margin-top: 10px;
display: block;
clear: none;
float: left;
}

.one-fourth a:active {
color: #551A8B;
}

.one-fourth br {
display: none;
}

Great!!!! this theme is wonderful
thanks, I wish I could know all tricks