.material-icons {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 36px;
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
  vertical-align: middle;
}

/* Change the color of the three lines on small devices (hamburger) icon to white */
.navbar-toggler-icon {
  /* Change the color of the icon to white */
  filter: invert(1);
  /* Change to a custom color (e.g., Red) using CSS filter */
  /* filter: invert(15%) sepia(90%) saturate(6000%) hue-rotate(350deg) brightness(100%) contrast(100%); */
}

/* If you want total control, you can override the background image with your own SVG string. You can find many SVG icons (like those on Bootstrap Icons) and encode them as a Data URI. */
/* Note: Change the stroke='rgba(255, 0, 0, 1)' part to your desired color. */
.navbar-toggler-icon {  
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 99, 71, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* If you want to change the color of the border around the button itself (not the lines), target the .navbar-toggler class directly: */
.navbar-toggler {
  border-color: #221f1f;
}