diff --git a/public/css/theme0.css b/public/css/theme0.css
index b8678523..94ccf1c9 100644
--- a/public/css/theme0.css
+++ b/public/css/theme0.css
@@ -6304,6 +6304,9 @@ body {
 .footer a {
   color: #777777;
 }
+.popover {
+  max-width: 600px;
+}
 #shifts td.free {
   border: 1px solid #d9534f;
   background-color: #f2dede;
diff --git a/public/css/theme1.css b/public/css/theme1.css
index b61c83f3..e14996b2 100644
--- a/public/css/theme1.css
+++ b/public/css/theme1.css
@@ -6327,6 +6327,9 @@ body {
 .footer a {
   color: #888888;
 }
+.popover {
+  max-width: 600px;
+}
 #shifts td.free {
   border: 1px solid #d9534f;
   background-color: #d9534f;
diff --git a/public/css/theme2.css b/public/css/theme2.css
index 77fc32ad..8fb67331 100644
--- a/public/css/theme2.css
+++ b/public/css/theme2.css
@@ -6304,6 +6304,9 @@ body {
 .footer a {
   color: #777777;
 }
+.popover {
+  max-width: 600px;
+}
 #shifts td.free {
   border: 1px solid #7f528b;
   background-color: #f1eaf2;
diff --git a/themes/base.less b/themes/base.less
index 83602c3b..3e552bc3 100644
--- a/themes/base.less
+++ b/themes/base.less
@@ -10,6 +10,10 @@ body {
   color: @text-muted;
 }
 
+.popover {
+  max-width: 600px;
+}
+
 #shifts {
   td {
     &.free {