Translation of this issue:

Element UI version

2.13.1

OS/Browsers version

windows/Chrome78

Vue version

2.6.11

Reproduction Link

https://codepen.io/pen/?&editable=true=https%3A%2F%2Felement.eleme.io%2F

Steps to reproduce

choose version 2.12.0

see component el-transfer, the transfer button's shape is round and position is updown
choose version 2.13.1

see component el-transfer, the transfer button's shape is square and position is left&right

What is Expected?

the transfer button's shape should be round and position is updown
the style of .el-transfer_button should be cover .el-button

What is actually happening?

the transfer button's shape is square and position is left&right

the style of .el-transfer_button was covered by .el-button

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