How to add outer border border? to echarts bar chart Ask for help

as shown in the figure, only one piece of border, can be added to each packet and the middle becomes 2px. You cannot add border to the outer frame of the whole! Ask for help

Jun.27,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdc7a2-31302.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdc7a2-31302.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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