May you explain what's going on in this snippet of code? I am not familiar with it.

.action-panel{
    @apply fixed left-0 flex flex-col top-72 space-y-2;
}
.action-button{
  @apply bg-white relative top-2 py-2 text-center px-6;
}
The provided snippet is using Tailwind CSS to define styles for two classes. The action-panel class is a fixed-position flex column with no left-hand spacing and some vertical spacing between column elements. The action-button class has a background color of white, relative position, center-aligned text, and some vertical and horizontal padding.