Container

Class provides a responsive fixed width throughout all devices.

HTML |
<div class="null-container">
     Your Code Goes Here ...
</div>

The size of the container on all screens:

.null-container {
     padding-left: 15px;
     padding-right: 15px;
     margin-left: auto;
     margin-right: auto;
}
@media (min-width: 576px) {.null-container { width: 540px; }}

@media (min-width: 768px) {.null-container { width: 720px; }}

@media (min-width: 992px) {.null-container { width: 960px; }}

@media (min-width: 1200px) {.null-container { width: 1140px; }}

@media (min-width: 1350px) {.null-container { width: 1320px; }}