Negate bootstrap .container fixed widths. This helps to span any element across the screen, even though its inside a .container without using position absolute or fixed

negate_bootstrap_container.scss

 
.spread-screen {
    width: 100vh;
  
  
    // bootstrap 4
    // the following are referenced from bootstrap.scss/_grid.scss
    // mixins/_grid.scss @make-container @make-container-max-widths mixins
    margin-left: -$spacer;
    @each $breakpoint, $container-max-width in $container-max-widths {
        @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
            margin-left: calc(-1 * (((100vw - #{$container-max-width}) / 2) + (#{$grid-gutter-width} / 2)));
        }
    }
}