fix: tools

oper/tools.md

@@ -13,7 +13,7 @@ Kubespray provides a set of Ansible roles for Kubernetes deployment and configur
 Link: https://github.com/kubernetes-incubator/kubespray  
 Cost: Free
 
-![#Minikube](https://2wded2jn6ekmzt6b3ruvnh15-wpengine.netdna-ssl.com/wp-content/uploads/2018/05/2-Minikube-768x745.png)
+<img width="159px" width="159px" src="https://2wded2jn6ekmzt6b3ruvnh15-wpengine.netdna-ssl.com/wp-content/uploads/2018/05/2-Minikube-768x745.png">
 
 ### **2. Minikube**