diff --git a/app/scripts/config/aria2Options.js b/app/scripts/config/aria2Options.js
index 459d7ed..e684731 100644
--- a/app/scripts/config/aria2Options.js
+++ b/app/scripts/config/aria2Options.js
@@ -58,6 +58,7 @@
         },
         'checksum': {
             type: 'string',
+            required: true,
             pattern: '^(md5|sha-(1|224|256|384|512))=[a-zA-Z0-9]+$'
         },
         'connect-timeout': {
diff --git a/app/styles/core/extend.css b/app/styles/core/extend.css
index 2393afd..b49c631 100644
--- a/app/styles/core/extend.css
+++ b/app/styles/core/extend.css
@@ -1,4 +1,13 @@
 /* bootstrap */
+.btn.active.focus,
+.btn.active:focus,
+.btn.focus,
+.btn:active.focus,
+.btn:active:focus,
+.btn:focus {
+    outline: none !important;
+}
+
 .btn-group + .btn {
     margin-left: 4px;
 }
@@ -110,6 +119,11 @@
 }
 
 /* awesome-bootstrap-checkbox extend */
+.checkbox input[type="checkbox"]:focus + label::before,
+.checkbox input[type="radio"]:focus + label::before {
+    outline: none !important;
+}
+
 .checkbox.checkbox-hide {
     padding-left: 0;
 }