update SVG blank space

Author: KatarinaYuan

index.html

@@ -184,10 +184,11 @@
       border: 1px solid var(--line);
       border-radius: 12px;
       background: linear-gradient(180deg, rgba(255,255,255,.8), rgba(246,251,250,.72));
-      min-height: 220px;
+      min-height: 240px;
+      height: clamp(260px, 34vh, 420px);
       overflow: hidden;
       position: relative;
-      flex: 1 1 58%;
+      flex: 0 0 auto;
     }
     svg { width: 100%; height: 100%; display: block; }
     .graph-node { cursor: grab; }
@@ -218,7 +219,7 @@
       padding: .58rem;
       min-height: 205px;
       overflow: auto;
-      flex: 1 1 42%;
+      flex: 1 1 auto;
     }
     .h-splitter {
       align-self: stretch;