Virtualbox6.1 installs centos7, no response to mouse click

There may be a problem with the kernel, which can be resolved after upgrading the kernel.

Specific solutions:

1、首先查内核版本：uname -r
2、升级内核：yum install -y kernel  或：yum update kernel -y
3、重启虚拟机内的centos7系统
4、发现原内核下安装的virtualbox增强失效，重新安装，报错：
centos安装增强功能出现kernel headers not found for target kernel
5、解决办法：
yum install kernel-headers kernel-devel gcc make -y
6、重启系统