Update app.css

Author: TechProblemSolver

app.css

@@ -104,6 +104,13 @@ header {
 }
 button {
     cursor: pointer;
+    background-color: rgb(204, 238, 249);
+    color: black;
+    box-shadow: 0px 0px 0px 3px black;
+    padding: 5px;
+    border: 1px solid black;
+    border-radius: 8px;
+    margin: 5px;
 }
 #form {
     border: 1px solid black;
@@ -183,4 +190,4 @@ span {
     height: 20px;
     box-shadow: 0px 0px 5px black;
     cursor: pointer;
-}
+}