.contentFill {
  /* Cross-browser solution for fill-available width */
  width: -webkit-fill-available;
  /* WebKit browsers (Chrome, Safari) */
  width: -moz-available;
  /* Firefox */
  width: 100%;
  /* Fallback for older browsers */
  /* Ensure the element takes full width of its container */
  box-sizing: border-box;
}