diff --git a/src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/App.vue b/src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/App.vue
index 2404920b7..7ab51ea75 100644
--- a/src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/App.vue
+++ b/src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/App.vue
@@ -84,16 +84,7 @@ export default {
 div.flex-bloc {
    margin-top: 1em;
    div.item-bloc {
-      flex-grow: 0; flex-shrink: 1; flex-basis: 25%;
-      
-      margin: 0;
-      border: 1px solid #000;
-      padding: 1em;
-      
-      &:not(:first-child) {
-         border-left: 0;
-      }
-      
+      flex-basis: 25%;
       ul.list-content {
          list-style-type: none;
          padding-left: 0;
diff --git a/src/Bundle/ChillMainBundle/Resources/public/scss/chillmain.scss b/src/Bundle/ChillMainBundle/Resources/public/scss/chillmain.scss
index b91aadb42..1d8c09bf2 100644
--- a/src/Bundle/ChillMainBundle/Resources/public/scss/chillmain.scss
+++ b/src/Bundle/ChillMainBundle/Resources/public/scss/chillmain.scss
@@ -79,6 +79,18 @@ div.flex-table {
    h2, h3, h4 {
       color: var(--chill-blue);
    }
+   div.item-bloc {
+      // We use box-shadow instead of border
+      // to avoid to manage border double-width 
+      // when blocs are resized for small screen !
+      // Then we can simulate border-collapse: collapse (table)
+      box-shadow: 
+          1px 0 0 0 #000, 
+          0 1px 0 0 #000, 
+          1px 1px 0 0 #000,   /* fix the corner */
+          1px 0 0 0 #000 inset, 
+          0 1px 0 0 #000 inset;
+   }
 }
 
 /*
@@ -94,21 +106,8 @@ div.flex-bloc {
    
    div.item-bloc {
       flex-grow: 0; flex-shrink: 1; flex-basis: 50%;
-      
       margin: 0;
-      border: 1px solid #000;
       padding: 1em;
-      
-      border-top: 0;
-      &:nth-child(1), &:nth-child(2) { 
-         border-top: 1px solid #000;
-      }
-      border-left: 0;
-      &:nth-child(odd) {
-         border-left: 1px solid #000;
-      }
-      
-      //background-color: #e6e6e6;
       display: flex;
       flex-direction: column;
          
@@ -145,12 +144,6 @@ div.flex-bloc {
    @media only screen and (max-width: 900px) {
       flex-direction: column;
       margin: auto 0;
-      div.item-bloc {
-         border-left: 1px solid #000;
-         &:nth-child(2) { 
-            border-top: 0;
-         }
-      }
    }
 }
 
@@ -167,11 +160,6 @@ div.flex-table {
       display: flex;
       flex-direction: column;
       padding: 1em;
-      border: 1px solid #000;
-      border-top: 0;
-      &:first-child {
-         border-top: 1px solid #000;
-      }
       &:nth-child(even) {
          background-color: #e6e6e6;         
       }
diff --git a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Requestor.vue b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Requestor.vue
index f951e0778..c01d4183d 100644
--- a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Requestor.vue
+++ b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Requestor.vue
@@ -144,7 +144,6 @@ div.flex-table {
    }
    div.item-bloc {
       background-color: white !important;
-      border: 1px solid #000;
       padding: 1em;
       margin-top: 1em;
       .content-bloc {