fix: Preserve HTTPS X-Forwarded-Proto in Nginx and configure SECURE_PROXY_SSL_HEADER in Django to fix 403 CSRF verification on Django Admin

backend/staticfiles/admin/css/forms.css

@@ -30,20 +30,18 @@ form .form-row p {
     flex-wrap: wrap;
 }
 
-.form-multiline > div,
-.form-multiline > fieldset {
+.form-multiline > div {
     padding-bottom: 10px;
 }
 
 /* FORM LABELS */
 
-legend, label {
+label {
     font-weight: normal;
     color: var(--body-quiet-color);
     font-size: 0.8125rem;
 }
 
-.required legend, legend.required,
 .required label, label.required {
     font-weight: bold;
 }
@@ -93,20 +91,6 @@ fieldset .inline-heading,
 
 /* ALIGNED FIELDSETS */
 
-.aligned fieldset {
-    flex-grow: 1;
-    border-top: none;
-}
-
-.aligned fieldset > div {
-    width: 100%;
-}
-
-.aligned legend {
-    float: inline-start;
-}
-
-.aligned legend,
 .aligned label {
     display: block;
     padding: 4px 10px 0 0;
@@ -149,7 +133,7 @@ form .aligned ul {
 }
 
 form .aligned div.radiolist {
-    display: block;
+    display: inline-block;
     margin: 0;
     padding: 0;
 }
@@ -217,8 +201,7 @@ fieldset .fieldBox {
 
 /* WIDE FIELDSETS */
 
-.wide label,
-.wide legend {
+.wide label {
     width: 200px;
 }
 
@@ -355,7 +338,7 @@ body.popup .submit-row {
     width: 48em;
 }
 
-.app-flatpages.model-flatpage #id_content {
+.flatpages-flatpage #id_content {
     height: 40.2em;
 }
 
@@ -430,12 +413,9 @@ body.popup .submit-row {
     border: none;
 }
 
-.inline-related.tabular div.wrapper {
-    overflow-x: auto;
-}
-
 .inline-related.tabular fieldset.module table {
     width: 100%;
+    overflow-x: scroll;
 }
 
 .last-related fieldset {
@@ -449,6 +429,7 @@ body.popup .submit-row {
 .inline-group .tabular tr td.original {
     padding: 2px 0 0 0;
     width: 0;
+    _position: relative;
 }
 
 .inline-group .tabular th.original {
@@ -456,19 +437,16 @@ body.popup .submit-row {
     padding: 0;
 }
 
-.inline-group .tabular td {
-    font-size: 1rem;
-}
-
 .inline-group .tabular td.original p {
     position: absolute;
     left: 0;
-    height: 1.2em;
+    height: 1.1em;
     padding: 2px 9px;
     overflow: hidden;
-    font-size: 0.875rem;
+    font-size: 0.5625rem;
     font-weight: bold;
     color: var(--body-quiet-color);
+    _width: 700px;
 }
 
 .inline-group div.add-row,