certificates.md

 # Generating SSL Certificates for testing purposes
-Generating Certificates for JetConf Server and Client using [OpenSSL](https://www.openssl.org/). Example certificates can be found in `data` [subdirectory](https://gitlab.labs.nic.cz/labs/jetconf/tree/master/data) in JetConf repository
 
-[Install OpenSSL](https://github.com/openssl/openssl), if not installed.
-```bash
-$ sudo apt-get install openssl
-```
+This tutorial explains how to generate self-signed certificates for the JetConf server and clients using [OpenSSL](https://www.openssl.org/). Example certificates can be found in `data` [subdirectory](https://gitlab.labs.nic.cz/labs/jetconf/tree/master/data) in JetConf repository.
+
+To start with, check that OpenSSL is installed. If not, it should be available as a package for your operating system.
+
+Two bash scripts placed in [JetConf repository](https://gitlab.labs.nic.cz/labs/jetconf/tree/master/utils/cert_gen) in `utils/cert_gen` directory are provided:
+
+ * `gen_server_cert.sh` is used once for generating the server certificate.
+ * `gen_client_cert.sh` is used repeatedly for creating client certificates.
+
+Their usage is described below.
+
+<div class="panel panel-warning">
+**Warning**
+{: .panel-heading}
+<div class="panel-body">
 
-Two bash scripts placed in [JetConf repository](https://gitlab.labs.nic.cz/labs/jetconf/tree/master/utils/cert_gen) in `utils/cert_gen` directory are provided. First script `gen_server_cert.sh` for generating server certificate and second script `gen_client_cert.sh` for creating client certificate. Their usage is described below.
+Self-signed certificates are of course not considered trustworthy by common web
+browsers and operating systems, so they are only suitable for testing.
 
-**WARNING: Such certificates are of course not considered trustworthy by common web
-browsers and operating systems, they are only suitable for testing.**
+</div>
+</div>
 
 ## Certification Authority (CA)
 To generate server and client certificates, you need to have CA like certificate to sign these certificates.