'Why I can't change background color of this section? CSS - Wordpress

I try to change color of a background section, but it doesn't work. This is the code!

.vc_custom_1481611144461 {
  padding-top: 35px !important;
  padding-bottom: 70px !important;
  background-color: #171b21 !important;
}

I try everything but i don't can't do more. Please help me!

Thank you for all answers!

css

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Solution	Source