/* Make the hamburger lines thinner */
.hamburger-inner, 
.hamburger-inner::before, 
.hamburger-inner::after {
  height: 1px; /* thinner stroke for each line */
}

/* Make the overall hamburger icon smaller */
.hamburger {
  width: 20px; /* shrink the width */
  height: 16px; /* shrink the height */
}