fix #277. set border to img in .markdown-wrap
fix #277. set border to img in .markdown-wrap

doortts/fork-yobi,naver/yobi,yona-projects/yona,ChangsungKim/TestRepository01,Limseunghwan/oss,doortts/fork-yobi,naver/yobi,naver/yobi,bloodybear/yona,yona-projects/yona,ChangsungKim/TestRepository01,bloodybear/yona,Limseunghwan/oss,doortts/forked-for-history,oolso/yobi,yona-projects/yona,Limseunghwan/oss,doortts/fork-yobi,bloodybear/yona,brainagenet/yobi,yona-projects/yona,doortts/forked-for-history,ihoneymon/yobi,oolso/yobi,bloodybear/yona,violetag/demo,doortts/forked-for-history,ihoneymon/yobi,oolso/yobi,ahb0327/yobi,brainagenet/yobi,doortts/fork-yobi,ihoneymon/yobi,ahb0327/yobi,ahb0327/yobi,violetag/demo,brainagenet/yobi