fix(theme): fix fontSize of blockquote in custom containers

src/client/theme-default/styles/components/custom-block.css

@@ -16,6 +16,7 @@
 .custom-block.info th,
 .custom-block.info blockquote > p {
   color: var(--vp-custom-block-info-text);
+  font-size: 14px;
 }
 
 .custom-block.info code {
@@ -31,6 +32,7 @@
 .custom-block.tip th,
 .custom-block.tip blockquote > p {
   color: var(--vp-custom-block-tip-text);
+  font-size: 14px;
 }
 
 .custom-block.tip code {
@@ -46,6 +48,7 @@
 .custom-block.warning th,
 .custom-block.warning blockquote > p {
   color: var(--vp-custom-block-warning-text);
+  font-size: 14px;
 }
 
 .custom-block.warning code {
@@ -61,6 +64,7 @@
 .custom-block.danger th,
 .custom-block.danger blockquote > p {
   color: var(--vp-custom-block-danger-text);
+  font-size: 14px;
 }
 
 .custom-block.danger code {
@@ -76,6 +80,7 @@
 .custom-block.details th,
 .custom-block.details blockquote > p {
   color: var(--vp-custom-block-details-text);
+  font-size: 14px;
 }
 
 .custom-block.details code {