feat: add glow to sun

src/assets/illu/horizon.svg

@@ -1,29 +1,77 @@
-<svg width="400" height="100" xmlns="http://www.w3.org/2000/svg">
+<svg width="400"
+     height="100"
+     xmlns="http://www.w3.org/2000/svg">
 
   <defs>
-    <linearGradient id="groundGradient" x1="0" y1="1" x2="0" y2="0">
-      <stop offset="0%" stop-color="black" stop-opacity="0" />
-      <stop offset="50%" stop-color="black" stop-opacity="0.01" />
-      <stop offset="100%" stop-color="black" stop-opacity="0.02" />
+    <linearGradient id="groundGradient"
+                    x1="0"
+                    y1="1"
+                    x2="0"
+                    y2="0">
+      <stop offset="0%"
+            stop-color="black"
+            stop-opacity="0" />
+      <stop offset="50%"
+            stop-color="black"
+            stop-opacity="0.01" />
+      <stop offset="100%"
+            stop-color="black"
+            stop-opacity="0.02" />
     </linearGradient>
 
     <mask id="fadeSides">
-      <linearGradient id="sideFade" x1="0" y1="0" x2="1" y2="0">
-        <stop offset="0%" stop-color="black" stop-opacity="0" />
-        <stop offset="20%" stop-color="white" stop-opacity="1" />
-        <stop offset="80%" stop-color="white" stop-opacity="1" />
-        <stop offset="100%" stop-color="black" stop-opacity="0" />
+      <linearGradient id="sideFade"
+                      x1="0"
+                      y1="0"
+                      x2="1"
+                      y2="0">
+        <stop offset="0%"
+              stop-color="black"
+              stop-opacity="0" />
+        <stop offset="20%"
+              stop-color="white"
+              stop-opacity="1" />
+        <stop offset="80%"
+              stop-color="white"
+              stop-opacity="1" />
+        <stop offset="100%"
+              stop-color="black"
+              stop-opacity="0" />
       </linearGradient>
-      <rect width="100%" height="100%" fill="url(#sideFade)" />
+      <rect width="100%"
+            height="100%"
+            fill="url(#sideFade)" />
     </mask>
+
+    <filter id="glow"
+            x="-50%"
+            y="-50%"
+            width="200%"
+            height="200%">
+      <feDropShadow dx="0"
+                    dy="0"
+                    stdDeviation="5"
+                    flood-color="white"
+                    flood-opacity="0.9" />
+    </filter>
+
+
   </defs>
-  <filter x="-50%" y="-50%" width="200%" height="200%"/>
+
+
+  <circle cx="200"
+          cy="50"
+          r="40"
+          filter="url(#glow)"
+          fill="#fff" />
 
 
 
-  <circle cx="200" cy="50" r="40" fill="#fff" />
-
-  <rect y="50" width="100%" height="50" fill="url(#groundGradient)" mask="url(#fadeSides)" />
+  <rect y="50"
+        width="100%"
+        height="50"
+        fill="url(#groundGradient)"
+        mask="url(#fadeSides)" />
 
 
 </svg>