Create .btn-arrow-left and add go back link.

musician/static/musician/css/default.css

@@ -7,6 +7,32 @@ a:hover {
     color: rgba(0,0,0,.7);
 }
 
+.btn-arrow-left{
+    color: #eee;
+    background: #D3D0DA;
+    position: relative;
+    padding: 8px 20px 8px 30px;
+    margin-left: 1em; /** equal value than arrow.left **/
+}
+
+.btn-arrow-left::after,
+.btn-arrow-left::before{
+    content: "";
+    position: absolute;
+    top: 50%;
+    left: -1em;
+
+    margin-top: -19px;
+    border-top: 19px solid transparent;
+    border-bottom: 19px solid transparent;
+    border-right: 1em solid;
+}
+
+.btn-arrow-left::after{
+    border-right-color: #D3D0DA;
+    z-index: 2;
+}
+
 .wrapper {
     display: flex;
     width: 100%;

musician/templates/musician/domain_detail.html

@@ -2,6 +2,8 @@
 {% load i18n %}
 
 {% block content %}
+<a id="vert_menu" class="btn-arrow-left" href="{% url 'musician:dashboard' %}">{% trans "Go back" %}</a>
+
 <h1 class="service-name">{% trans "DNS settings for" %} <span class="font-weight-light">{{ object.name }}</span></h1>
 <p class="service-description">Litle description of what to be expected in this section to aid the user. Even a link to more help if there is one available.</p>