diff --git a/docs/_static/gallery.css b/docs/_static/gallery.css
deleted file mode 100644
index e5f79a8c5a..0000000000
--- a/docs/_static/gallery.css
+++ /dev/null
@@ -1,195 +0,0 @@
-/*
-Sphinx-Gallery has compatible CSS to fix default sphinx themes
-Tested for Sphinx 1.3.1 for all themes: default, alabaster, sphinxdoc,
-scrolls, agogo, traditional, nature, haiku, pyramid
-Tested for Read the Docs theme 0.1.7 */
-.sphx-glr-thumbcontainer {
-  background: #fff;
-  border: solid #fff 1px;
-  -moz-border-radius: 5px;
-  -webkit-border-radius: 5px;
-  border-radius: 5px;
-  box-shadow: none;
-  float: left;
-  margin: 5px;
-  min-height: 230px;
-  padding-top: 5px;
-  position: relative;
-}
-.sphx-glr-thumbcontainer:hover {
-  border: solid #6200EE 1px;
-  box-shadow: 0 0 15px rgba(163, 142, 202, 0.5);
-}
-.sphx-glr-thumbcontainer a.internal {
-  bottom: 0;
-  display: block;
-  left: 0;
-  padding: 150px 10px 0;
-  position: absolute;
-  right: 0;
-  top: 0;
-}
-/* Next one is to avoid Sphinx traditional theme to cover all the
-thumbnail with its default link Background color */
-.sphx-glr-thumbcontainer a.internal:hover {
-  background-color: transparent;
-}
-
-.sphx-glr-thumbcontainer p {
-  margin: 0 0 .1em 0;
-}
-.sphx-glr-thumbcontainer .figure {
-  margin: 10px;
-  width: 160px;
-}
-.sphx-glr-thumbcontainer img {
-  display: inline;
-  max-height: 112px;
-  max-width: 160px;
-}
-.sphx-glr-thumbcontainer[tooltip]:hover:after {
-  background: rgba(0, 0, 0, 0.8);
-  -webkit-border-radius: 5px;
-  -moz-border-radius: 5px;
-  border-radius: 5px;
-  color: #fff;
-  content: attr(tooltip);
-  left: 95%;
-  padding: 5px 15px;
-  position: absolute;
-  z-index: 98;
-  width: 220px;
-  bottom: 52%;
-}
-.sphx-glr-thumbcontainer[tooltip]:hover:before {
-  border: solid;
-  border-color: #333 transparent;
-  border-width: 18px 0 0 20px;
-  bottom: 58%;
-  content: '';
-  left: 85%;
-  position: absolute;
-  z-index: 99;
-}
-
-.sphx-glr-script-out {
-  color: #888;
-  margin: 0;
-}
-p.sphx-glr-script-out {
-    padding-top: 0.7em;
-}
-.sphx-glr-script-out .highlight {
-  background-color: transparent;
-  margin-left: 2.5em;
-  margin-top: -2.1em;
-}
-.sphx-glr-script-out .highlight pre {
-  background-color: #fafae2;
-  border: 0;
-  max-height: 30em;
-  overflow: auto;
-  padding-left: 1ex;
-  margin: 0px;
-  word-break: break-word;
-}
-.sphx-glr-script-out + p {
-  margin-top: 1.8em;
-}
-blockquote.sphx-glr-script-out {
-  margin-left: 0pt;
-}
-.sphx-glr-script-out.highlight-pytb .highlight pre {
-  color: #000;
-  background-color: #ffe4e4;
-  border: 1px solid #f66;
-  margin-top: 10px;
-  padding: 7px;
-}
-
-div.sphx-glr-footer {
-    text-align: center;
-}
-
-div.sphx-glr-download {
-  margin: 1em auto;
-  vertical-align: middle;
-}
-
-div.sphx-glr-download a {
-  background-color: #ffc;
-  background-image: linear-gradient(to bottom, #FFC, #d5d57e);
-  border-radius: 4px;
-  border: 1px solid #c2c22d;
-  color: #000;
-  display: inline-block;
-  font-weight: bold;
-  padding: 1ex;
-  text-align: center;
-}
-
-div.sphx-glr-download code.download {
-  display: inline-block;
-  white-space: normal;
-  word-break: normal;
-  overflow-wrap: break-word;
-  /* border and background are given by the enclosing 'a' */
-  border: none;
-  background: none;
-}
-
-div.sphx-glr-download a:hover {
-  box-shadow: inset 0 1px 0 rgba(255,255,255,.1), 0 1px 5px rgba(0,0,0,.25);
-  text-decoration: none;
-  background-image: none;
-  background-color: #d5d57e;
-}
-
-.sphx-glr-example-title > :target::before {
-  display: block;
-  content: "";
-  margin-top: -50px;
-  height: 50px;
-  visibility: hidden;
-}
-
-ul.sphx-glr-horizontal {
-  list-style: none;
-  padding: 0;
-}
-ul.sphx-glr-horizontal li {
-  display: inline;
-}
-ul.sphx-glr-horizontal img {
-  height: auto !important;
-}
-
-.sphx-glr-single-img {
-  margin: auto;
-  display: block;
-  max-width: 100%;
-}
-
-.sphx-glr-multi-img {
-  max-width: 42%;
-  height: auto;
-}
-
-p.sphx-glr-signature a.reference.external {
-  -moz-border-radius: 5px;
-  -webkit-border-radius: 5px;
-  border-radius: 5px;
-  padding: 3px;
-  font-size: 75%;
-  text-align: right;
-  margin-left: auto;
-  display: table;
-}
-
-.sphx-glr-clear{
-  clear: both;
-}
-
-a.sphx-glr-backref-instance {
-  text-decoration: none;
-}
diff --git a/docs/conf.py b/docs/conf.py
index 8db8baadc0..2ea1b522c4 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -68,7 +68,6 @@
 
 html_static_path = ["_static"]
 templates_path = ["_templates"]
-html_css_files = ["gallery.css"]
 
 nbsphinx_timeout = 360
 nbsphinx_execute = os.getenv("QISKIT_DOCS_BUILD_TUTORIALS", "never")