@media screen and (max-width:700px){div.forum{width:calc(100% - 20px)}div.ad{width:100%;text-align:center}.bd_forum{width:calc(100% - 20px);margin:0 10px;text-align:center}}@media screen and (max-width:550px){.forum .forum_fieldset_top{width:calc(100% - 28px);height:auto;}}