htwkalender-pwa/frontend/public/primevue-sass-theme/theme-base/components/misc/_scrolltop.scss

// core
.p-scrolltop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.p-scrolltop-sticky {
  position: sticky;
}

.p-scrolltop-sticky.p-link {
  margin-left: auto;
}

.p-scrolltop-enter-from {
  opacity: 0;
}

.p-scrolltop-enter-active {
  transition: opacity 0.15s;
}

.p-scrolltop.p-scrolltop-leave-to {
  opacity: 0;
}

.p-scrolltop-leave-active {
  transition: opacity 0.15s;
}

// theme
.p-scrolltop {
  width: $scrollTopWidth;
  height: $scrollTopHeight;
  border-radius: $scrollTopBorderRadius;
  box-shadow: $inputOverlayShadow;
  transition: $actionIconTransition;

  &.p-link {
    background: $scrollTopBg;

    &:hover {
      background: $scrollTopHoverBg;
    }
  }

  .p-scrolltop-icon {
    font-size: $scrollTopFontSize;
    color: $scrollTopTextColor;

    &.p-icon {
      width: $scrollTopFontSize;
      height: $scrollTopFontSize;
    }
  }
}