elementui $confirm确认提示按钮居中

// 解绑
    unBind(row) {
      this.$confirm('是否确认解除该条表单绑定？', '确认', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        customClass: 'customConfirm',
        cancelButtonClass: 'btn-custom-cancel',
        type: 'warning'
      })
        .then(() => {
          this.$Puting(this.$api.updateFormBind, { relationId: row.relationId, defId: '' }).then((res) => {
            if (res.code === '0') {
              this.$message.success('解绑成功')
              this.updateData(row.pid)
            } else {
              this.$message.error(res.message)
            }
          })
        })
        .catch(() => {})
    },

增加了自定义样式 customConfirm 和 btn-custom-cancel
修改样式

.customConfirm .el-message-box__btns {
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn-custom-cancel {
  margin-left: 10px;
  order: 2 /* 将取消置到后面 */
}