feat: improve spacing

src/App.css

@@ -22,6 +22,13 @@ h2 {
   background-color: ghostwhite;
 }
 
+.container {
+  display: flex;
+  flex-wrap: nowrap;
+  justify-content: space-evenly;
+  min-width: min(80vw, 800px);
+}
+
 .dragbox {
   display: flex;
   flex-direction: column;
@@ -33,14 +40,21 @@ h2 {
 
 .box {
   min-width: 30%;
+  max-width: 10vw;
   padding: 4px;
-  margin: 4px auto;
+  margin: 4px min(2px, 4%);
   border-style: solid;
   border-color: black;
 }
 
 .user {
-  max-width: 80%;
+  max-width: 80vw;
+  width: 80%;
+  margin: auto;
+  .item {
+    font-weight: bold;
+    border-style: solid;
+  }
 }
 
 .item {