Why aren't burger button styles showing up in Safari?

Question

css

Hello! Faced a problem with displaying burger button styles in Safari. That is, the button itself is clickable, it opens the menu, but the styles seem to have not been applied to it. What could be the problem? Below is the html and css code of the button

<button class="header__btn" aria-label="Открыть меню">
      <span></span>
      <span></span>
      <span></span>
</button>

&__btn {
position: absolute;
z-index: 3;
top: 51px;
right: 42px;
display: flex;
flex-direction: column;
justify-content: space-around;
width: 40px;
height: 40px;

span {
  display: block;
  transition: .2s;
  width: 100%;
  height: 4px;
  background-color: var(--color-orange);
}