add fixed button bottom
#fixed_button{ position: fixed; z-index: 999; right: 0.75rem; bottom: 0.75rem; display: none; width: 2.625rem; height: 2.625rem; border-radius: 1.875rem; background: #4f3cda url("../images/up-arrow.png") no-repeat center 47%; background-size: auto; background-size: 1.125rem 1.125rem; text-indent: -9999px; }