diff --git a/src/style.css b/src/style.css
index ca039919..63c0850f 100644
--- a/src/style.css
+++ b/src/style.css
@@ -844,11 +844,18 @@ input[type='number']::-webkit-outer-spin-button {
 .border-radius-preview-box {
   width: 250px;
   height: 250px;
-  border: 1px dashed var(--text-color);
+  outline: 1px dashed var(--text-color);
+  display: flex;
+  align-items: center;
+  justify-content: center;
   margin-bottom: 1rem;
   position: relative;
 }
 
+.border-radius-preview-box + .btn-container {
+  margin-top: 1rem;
+}
+
 .border-radius-preview-box .preview {
   width: inherit;
   height: inherit;