diff --git a/release_notes.md b/release_notes.md
index e4e01e3..f32a097 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -6,6 +6,7 @@
  - Polar plot is activated when `phi`, `Phi`, `theta`, `Theta`, `r` or `R` is the variable.
  - Unordered list for displaying a list of action results.
  - Basic graph information (as a list).
+ - Integrate with respect to any variable.
 
 # 23-12-2018
 
diff --git a/static/app.js b/static/app.js
index e334a07..80c6907 100644
--- a/static/app.js
+++ b/static/app.js
@@ -408,6 +408,7 @@ var app = new Vue({
             http.post('graph_info', { 'expression': this.expr() },
                 (result) => {
                     this.action_in = 'The graph $G$ contains the following properties:'; // +weight
+                    this.action_out = "";
                     this.action_out_list.push('The degree row of $G$ is $' + result.out['degrees'] + '$.');
                     this.action_out_list.push('The sum of the degree row is $' + result.out['degrees_sum'] + '$.');
                     this.latex();
diff --git a/templates/index.html b/templates/index.html
index 5fc3ec2..3f0d56c 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -131,7 +131,7 @@ <h1>$\oint$ Calcupy <small class="subtitle">Calculus powered graphical calculato
                                 <button v-if="variables.length == 1" type="button" class="btn btn-primary" v-on:click="diff2(variables[0])">$\textrm{d}^2 / \textrm{d}{{variables[0]}}^2$</button>
                                 <button v-if="variables.length > 1" v-for="v in variables" type="button" class="btn btn-primary" v-on:click="diff(v)">$\partial / \partial {{ v }}$</button>
                                 <button v-if="variables.length > 1" v-for="v in variables" type="button" class="btn btn-primary" v-on:click="diff2(v)">$\partial^2 / \partial {{ v }}^2$</button>
-                                <button v-if="variables.length == 1" type="button" class="btn btn-primary" v-on:click="integrate(variables[0])">$\int$</button>
+                                <button v-if="variables.length > 0" v-for="v in variables" type="button" class="btn btn-primary" v-on:click="integrate(v)">$\int d{{v}}$</button>
                                 <button v-if="variables.length == 1" type="button" class="btn btn-primary" v-on:click="integrate(variables[0], '0', 'T')">$\int_0^T$</button>
                                 <button v-if="variables.length == 1" type="button" class="btn btn-primary" v-on:click="integrate(variables[0], '-oo', 'oo')">$\int_{-\infty}^{+\infty}$</button>
                                 <button v-if="variables.length > 1 && is_algebraic" type="button" class="btn btn-primary" v-on:click="grad">$\nabla f$</button>
@@ -193,9 +193,9 @@ <h1>$\oint$ Calcupy <small class="subtitle">Calculus powered graphical calculato
                 </div>
 
                 <div v-if="action_out || action_out_list" id="action-result" :class="[ action_out ? 'fade-in' : '' ]" :key="action_out">
-                    {{action_in}}
+                    <div>{{action_in}}</div>
                     <hr/>
-                    {{action_out}}
+                    <div>{{action_out}}</div>
                     <ul v-if="action_out_list">
                         <li v-for="item in action_out_list">{{item}}</li>
                     </ul>