Header increases as soon as you hover over

Store Design
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2
  1. In the left-hand sidebar, navigate to the “Assets” folder and open the file that contains your theme’s CSS (usually named theme.scss.liquid or theme.css.liquid).
  2. Scroll down to find the CSS code related to the hover effect on the categories.
/* Example CSS code */
.navigation__dropdown-link:hover {
  /* Hover styles here */
  font-size: 20px;
  color: red;
}
​