diff --git a/core/themes/seven/install-page-rtl.css b/core/themes/seven/install-page-rtl.css
deleted file mode 100644
index 45b21d8..0000000
--- a/core/themes/seven/install-page-rtl.css
+++ /dev/null
@@ -1,32 +0,0 @@
-/**
- * @file
- * Right-to-left styles for installation.
- */
-
-body.install-page #page {
-  padding: 1em 0 1em 2em;
-}
-body.install-page #content {
-  padding-left: 0;
-  padding-right: 30px;
-}
-body.install-page #site-name {
-  margin: 0.75em 50px 0.75em 0;
-}
-.install-task-list {
-  margin-right: 0;
-  padding-right: 0;
-}
-.install-task-list li {
-  padding: 0.5em 20px 0.5em 1em;
-}
-.install-task-list li.active:after {
-  left: auto;
-  right: 100%;
-  border-left-color: transparent;
-  border-right-color: #ebeae4;
-}
-.step-indicator {
-  left: 40px;
-  right: auto;
-}
diff --git a/core/themes/seven/install-page.css b/core/themes/seven/install-page.css
index b439326..cf6e849 100644
--- a/core/themes/seven/install-page.css
+++ b/core/themes/seven/install-page.css
@@ -50,6 +50,9 @@ body.install-page {
     box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
     padding: 1em 2em 1em 0; /* LTR */
   }
+  [dir=rtl] body.install-page #page {
+    padding: 1em 0 1em 2em;
+  }
   body.install-page #content {
     -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
@@ -59,6 +62,10 @@ body.install-page {
     padding-left: 30px; /* LTR */
     width: 65%;
   }
+  [dir=rtl] body.install-page #content {
+    padding-left: 0;
+    padding-right: 30px;
+  }
   body.install-page #sidebar-first {
     float: left;
     width: 35%;
@@ -70,6 +77,9 @@ body.install-page #site-name {
   color: #0074bd;
   margin: 0.75em 0 0.75em 50px; /* LTR */
 }
+[dir=rtl] body.install-page #site-name {
+  margin: 0.75em 50px 0.75em 0;
+}
 body.install-page #page-title {
   background: transparent;
   padding-top: 0;
@@ -93,10 +103,17 @@ body.install-page #page-title {
   padding-left: 0; /* LTR */
   padding-bottom: 1em;
 }
+[dir=rtl] .install-task-list {
+  margin-right: 0;
+  padding-right: 0;
+}
 .install-task-list li {
   padding: 0.5em 1em 0.5em 50px; /* LTR */
   color: #1a1a1a;
 }
+[dir=rtl] .install-task-list li {
+  padding: 0.5em 20px 0.5em 1em;
+}
 .install-task-list li.active {
   background: #ebeae4;
   position: relative;
@@ -116,6 +133,12 @@ body.install-page #page-title {
   top: 50%;
   margin-top: -17px;
 }
+[dir=rtl] .install-task-list li.active:after {
+  left: auto;
+  right: 100%;
+  border-left-color: transparent;
+  border-right-color: #ebeae4;
+}
 .install-task-list li.done {
   color: #adadad;
 }
@@ -137,6 +160,10 @@ body.install-page #page-title {
     top: 1.9em;
     right: 40px;
   }
+  [dir=rtl] .step-indicator {
+  left: 40px;
+  right: auto;
+  }
 }
 .install-page .password-parent {
   width: auto;