wp-scroll-up

Instalace

1. Click Plugins > Add New in the WordPress admin panel.
2. Search for „wp-scroll-up“ and install.

Customization

The Style dropdown changes the button style displayed. These
correspond to CSS styles present in the plugin’s CSS directory.

When you choose the Custom style, the plugin automatically adds the
CSS file located at {current_theme}/wp-scroll-up/custom.css.

This CSS file must contain an ID selector, #scrollUp and it’s custom
style attributes. For instance, the bundled image style is provided by the
CSS,

/* Image style */
#scrollUp {
  bottom: 20px;
  right: 20px;
  height: 38px; /* Height of image */
  width: 38px; /* Width of image */
  background: url(../img/top.png) no-repeat;
}

Other settings that can be changed,

• Scroll Text: The text label of the button.
• Scroll Distance: The number of pixels that a user needs to scroll
  before they see the button.
• Scroll Speed: Duration in milliseconds to scroll to top.
• Animation: Whether the scroll button should Fade in/out