style input

index.php

@@ -42,8 +42,12 @@
                 display: none;
             }
 
+            #signature-input {
+                width: calc(100% - 140px);
+            }
+
             input[type=submit] {
-                width: 64px;
+                width: 100%; /* so that it's not so close to clear, might think of a better solution later */
                 float: right;
                 background: var(--accent);
                 color: white;