fix button text vertical align

src/styles/global.css

@@ -69,6 +69,10 @@ body :not(textarea) {
   background-color: #13bb8a;
 }
 
+.ivu-btn.qm-primary-button {
+  line-height: 1.5em;
+}
+
 .qm-secondary-button {
   height: 36px;
   font-size: 14px;
@@ -85,6 +89,10 @@ body :not(textarea) {
   background-color: #ffffff;
 }
 
+.ivu-btn.qm-secondary-button {
+  line-height: 1.5em;
+}
+
 .qm-icon-button {
   height: 36px;
   font-size: 36px;