fix webdav and calendar button in dashboard

frontend/src/css/Dashboard.styl

     justify-content space-between
     flexwrap wrap
     &__webdav
-      margin-bottom 40px
+      margin 0 15px 40px 0
       &__btn
         width 300px
       &__information
-        width 550px
+        width 300px
     &__calendar
       margin-bottom 100px
       &__wrapperBtn
-        margin-right 300px
+        margin-right 290px
       &__btn
         width 300px
       &__information
-        width 550px
+        width 300px
 
 /**** MEDIAQUERIES *****/