for about us page
body > .row.about-us-row {
margin-top: 15px;
padding-right: 10px;
padding-left: 10px;
min-height: 100px;
max-width: none;
background-color: #bebebe;
}
Remove the margin
and for contact us page
body > .row.contact-us-row {
margin-top: 15px;
padding-right: 10px;
padding-left: 10px;
min-height: 100px;
max-width: none;
background-color: #bebebe;
}
Remove the margin or set the value to 0 (zero)