Problems with the bootstrap in CSS [selection 8]


can anyone see where I am able to make a correction: I am getting error/ set the border bottom to 1px solid #dbdbdb: I did that; I am still getting error...
here is my code set

.neighborhood-guides {
background-color: #efefef;
border-bottom: 1px solid #dbdbdb;

.neighborhood-guides h2 {
color: #393c3d;
font-size: 24px;

.neighborhood-guides p {
font-size: 15px;
margin-bottom: 13px;


Have you had a chance to look at this thread yet: