Align button width to labels

The action buttons and "up-to-date" labels are better to be
roughly of the same width, so that UX can "jump" a lot less
during transitions.

Change-Id: If017a4c5c4aa4ff0b25384a809b2e93fce0026f0

src/main/resources/static/css/style.css

diff --git a/src/main/resources/static/css/style.css b/src/main/resources/static/css/style.css
index 2816380..e187458 100644
--- a/src/main/resources/static/css/style.css
+++ b/src/main/resources/static/css/style.css
@@ -24,6 +24,10 @@
   width: 65px;
 }
 
+button.btn-sm {
+  width: 83px;
+}
+
 button.btn-100 {
   width: 100%;
 }