Improve dropzone size

app/styles/app.css

@@ -215,12 +215,12 @@ body {
 .dropzone {
   border: 2px dashed #ccc;
   border-radius: 8px;
-  padding: 2rem 1.5rem;
   text-align: center;
   transition: all 0.2s ease;
   margin: 1.5rem 0 1rem;
   background-color: rgb(255 255 255 / 2%);
   cursor: pointer;
+  aspect-ratio: 4 / 3;
 }
 
 .dropzone.is-dragging {
@@ -232,9 +232,12 @@ body {
   display: flex;
   flex-direction: column;
   align-items: center;
+  justify-content: center;
   gap: 1rem;
   cursor: pointer;
   color: #898989;
+  width: 100%;
+  height: 100%;
 }
 
 .dropzone-label p {