diff --git a/biscuit/apps/chronos/templates/chronos/tt_lesson.html b/biscuit/apps/chronos/templates/chronos/tt_lesson.html
index e2562f925fc925ed9ef8307e19346dfcc6f30179..cde39dedcc2990c92579cc3a42fa97e74b3865ca 100644
--- a/biscuit/apps/chronos/templates/chronos/tt_lesson.html
+++ b/biscuit/apps/chronos/templates/chronos/tt_lesson.html
@@ -1,4 +1,4 @@
-<div class="card" style="width: 18rem; {% if lesson.colour_fg %} color: {{ lesson.colour_fg }}; {% endif %} {% if lesson.colour_bg %} background-color: {{ lesson.colour_bg }}; {% endif %}">
+<div class="card" style="{% if lesson.colour_fg %} color: {{ lesson.colour_fg }}; {% endif %} {% if lesson.colour_bg %} background-color: {{ lesson.colour_bg }}; {% endif %}">
  <div class="card-body">
   <div class="row">
    <div class="col-sm">