diff --git a/lms/lmsdb/models.py b/lms/lmsdb/models.py
index 1b6ecca5..585e1781 100644
--- a/lms/lmsdb/models.py
+++ b/lms/lmsdb/models.py
@@ -590,7 +590,7 @@ class SolutionAssessment(BaseModel):
     name = CharField()
     icon = CharField(null=True)
     color = CharField()
-    active_color = CharField()
+    active_color = CharField(default="#fff")
     order = IntegerField(default=0, index=True)
     course = ForeignKeyField(Course, backref='assessments')
 
@@ -718,6 +718,19 @@ def ordered_versions(self) -> Iterable['Solution']:
     def test_results(self) -> Iterable[dict]:
         return SolutionExerciseTestExecution.by_solution(self)
 
+    @staticmethod
+    def _get_summary(solution: 'Solution') -> dict:
+        exercise = {}
+        exercise['solution_id'] = solution.id
+        exercise['is_checked'] = solution.is_checked
+        exercise['comments_num'] = len(solution.staff_comments)
+        if solution.is_checked and solution.checker:
+            exercise['checker'] = solution.checker.fullname
+        if solution.assessment:
+            exercise['assessment'] = solution.assessment.name
+            exercise['grade_color'] = solution.assessment.color
+        return exercise
+
     @classmethod
     def of_user(
         cls, user_id: int, with_archived: bool = False,
@@ -737,15 +750,10 @@ def of_user(
             .order_by(cls.submission_timestamp.desc())
         )
         for solution in solutions:
-            exercise = exercises[solution.exercise_id]
-            if exercise.get('solution_id') is None:
-                exercise['solution_id'] = solution.id
-                exercise['is_checked'] = solution.is_checked
-                exercise['comments_num'] = len(solution.staff_comments)
-                if solution.is_checked and solution.checker:
-                    exercise['checker'] = solution.checker.fullname
-                if solution.assessment:
-                    exercise['assessment'] = solution.assessment.name
+            id_ = solution.exercise_id
+            if exercises[id_].get('solution_id') is None:
+                exercises[id_].update(cls._get_summary(solution))
+
         return tuple(exercises.values())
 
     @property
@@ -1244,11 +1252,20 @@ def create_basic_roles() -> None:
 
 def create_basic_assessments() -> None:
     assessments_dict = {
-        'Excellent': {'color': 'green', 'icon': 'star', 'order': 1},
-        'Nice': {'color': 'blue', 'icon': 'check', 'order': 2},
-        'Try again': {'color': 'red', 'icon': 'exclamation', 'order': 3},
+        'Excellent': {
+            'color': 'green', 'icon': 'star', 'order': 1,
+        },
+        'Nice': {
+            'color': 'blue', 'icon': 'check', 'order': 2,
+        },
+        'Try again': {
+            'color': 'red', 'icon': 'exclamation', 'order': 3,
+        },
+        'Invalid': {
+            'color': 'red', 'icon': 'ban', 'order': 4,
+        },
         'Plagiarism': {
-            'color': 'black', 'icon': 'exclamation-triangle', 'order': 4,
+            'color': 'black', 'icon': 'exclamation-triangle', 'order': 5,
         },
     }
     courses = Course.select()
diff --git a/lms/static/my.css b/lms/static/my.css
index c01495cf..5a724cf7 100644
--- a/lms/static/my.css
+++ b/lms/static/my.css
@@ -124,16 +124,18 @@ a {
 
 .exercise {
   align-items: center;
-  background: #f8f8f8;
-  border-radius: 5px;
-  border: 1px solid;
+  background: #f8f9fa;
+  border-radius: 10px;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
   display: flex;
   flex-direction: row;
   justify-content: space-between;
-  margin-bottom: 0.5rem;
-  padding: 1rem;
-  text-align: center;
+  margin-bottom: 1rem;
   overflow: auto;
+  padding: 0.75rem;
+  text-align: center;
+  border-right: #00000000 8px solid;
+  border-left: #00000000 8px solid;
 }
 
 .centered {
@@ -146,26 +148,34 @@ a {
   align-items: stretch;
 }
 
+.right-side {
+  justify-content: start;
+}
+
 .left-side {
   justify-content: end;
 }
 
 .exercise-number {
   align-items: center;
-  border-radius: 100%;
-  border: 1px solid;
   display: flex;
-  height: 3rem;
   justify-content: center;
   overflow: hidden;
   text-align: center;
-  width: 3rem;
+  font-size: 1.2rem;
+  margin-right: 1rem;
+  color: #495057;
+  padding: 0.25rem 0.75rem;
+  border-radius: 15px;
+  min-width: 4rem;
+  justify-content: start;
 }
 
 .exercise-name {
   align-items: center;
   display: flex;
-  font-size: 1.5em;
+  font-size: 1.4rem;
+  line-height: 1.3;
   height: 3rem;
   justify-content: center;
   text-align: center;
@@ -224,65 +234,62 @@ button#share-action:hover {
   border-bottom-right-radius: 0;
 }
 
-.go-send {
-  background: #247ba0;
-  color: #ebf3f6;
-}
-
-.go-send:hover {
-  color: #ebf3f6;
-}
-
-.go-view {
-  background: #ffe066;
-  color: #18150a;
-}
-
-.go-view:hover {
-  color: #18150a;
+#back-to-exercises {
+  width: 100%;
+  margin-top: 5vh;
 }
 
-.go-checked {
-  background: #70c1b3;
-  color: #0b1211;
+.our-button {
+  align-items: center;
+  background-color: #ffffff;
+  border-radius: 20px;
+  border: 1px solid #dee2e6;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
+  color: #495057;
+  cursor: pointer;
+  display: flex;
+  font-size: 0.9rem;
+  font-weight: 500;
+  justify-content: space-between;
+  margin: 0.5em;
+  width: 8em;
+  padding: 0.55rem 1rem;
+  text-align: center;
+  transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
 }
 
-.go-checked:hover {
-  color: #0b1211;
+.our-button:hover {
+  background-color: #0d6efd;
+  color: white;
+  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
+  transform: translateY(-2px);
 }
 
-.go-grader {
-  background: #b2dbbf;
-  color: #1f2d3d;
+.our-button:active {
+  transform: translateY(1px);
+  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
 }
 
-.go-grader:hover {
-  color: #1f2d3d;
+.our-button.active, .our-button:checked {
+  background-color: #28a745;
+  color: white;
 }
 
-#back-to-exercises {
-  width: 100%;
-  margin-top: 5vh;
+.our-button.active:hover, .our-button:checked:hover {
+  background-color: #218838; /* Slightly darker green on hover */
 }
 
-.our-button {
-  border-radius: 8px;
-  display: flex;
-  margin-right: 0.5em;
-  outline: none;
-  padding: 0.55rem 1rem;
-  white-space: nowrap;
-  justify-content: space-between;
-  align-items: center;
-  height: 3em;
-  width: 8em;
+@keyframes pop {
+  0% { transform: scale(0.9); }
+  50% { transform: scale(1.1); }
+  100% { transform: scale(1); }
 }
 
-.our-button:hover {
-  text-decoration: none;
+.our-button:active {
+  animation: pop 0.5s;
 }
 
-.our-button-narrow {
+button.our-button-narrow, a.our-button-narrow {
   width: 2em;
   display: flex;
   align-items: center;
@@ -887,19 +894,44 @@ code .grader-add .fa {
 }
 
 .which-notebook {
+  align-items: center;
   align-self: center;
+  display: flex;
   margin-inline-end: 1rem;
 }
 
+.fa-book {
+  color: #495057;
+  font-size: 1rem;
+  margin-inline-end: 0.25rem;
+  vertical-align: middle; 
+}
+
 .comments-count {
+  display: flex;
+  align-items: center;
+  font-size: 0.9rem;
+  color: #495057;
   display: flex;
   align-self: center;
   align-items: center;
-  font-size: 1.25rem;
   font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   margin-inline-end: 1rem;
 }
 
+.comments-count .our-badge {
+  background-color: #e9ecef; /* Neutral background */
+  color: #495057; /* Dark text color for readability */
+  padding: 0.25rem 0.5rem;
+  font-size: 0.75rem;
+  border-radius: 15px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  margin-inline-end: 0.5rem;
+  box-shadow: none; /* Remove the shadow if you prefer a flat design */
+}
+
 #courses-list {
   overflow-y: auto;
   max-height: 10em;
diff --git a/lms/templates/exercises.html b/lms/templates/exercises.html
index 0b08335f..3abb75ed 100644
--- a/lms/templates/exercises.html
+++ b/lms/templates/exercises.html
@@ -10,16 +10,12 @@ <h1 id="exercises-head">{{ _('Exercises') }}</h1>
     </div>
     <div id="exercises">
       {%- for exercise in exercises %}
-      <div class="exercise">
+      <div class="exercise" {%- if exercise.grade_color %} style="border-right: 8px solid {{ exercise.grade_color }};" {%- endif -%}>
         <div class="right-side {{ direction }}-language">
           <div class="exercise-number me-3">{{ exercise['exercise_number'] }}</div>
           <div class="exercise-name"><div class="ex-title">{{ exercise['exercise_name'] | e }}</div></div>
         </div>
         <div class="left-side">
-          <div class="comments-count">
-            <span class="badge bg-secondary">{{ exercise['comments_num'] }}</span>
-            <span class="visually-hidden">{{ _("Comments for the solution") }}</span>
-          </div>
           {%- if exercise['notebook'] %}
           <div class="which-notebook">
             <i class="fa fa-book" aria-hidden="true"></i>
@@ -39,11 +35,6 @@ <h1 id="exercises-head">{{ _('Exercises') }}</h1>
             <i class="fa fa-{{ details['icon'] }}" aria-hidden="true"></i>
           </a>
           {% endif -%}
-          {% if is_manager %}
-          <a class="our-button our-button-narrow go-grader" href="check/{{ exercise['exercise_id'] }}">
-            <i class="fa fa-graduation-cap" aria-hidden="true"></i>
-          </a>
-          {% endif %}
         </div>
       </div>
       {% endfor -%}
diff --git a/tests/test_solutions.py b/tests/test_solutions.py
index f01c5a4e..22a02d7c 100644
--- a/tests/test_solutions.py
+++ b/tests/test_solutions.py
@@ -686,3 +686,15 @@ def test_solutions_of_user(
         exercises = solution.of_user(student_user.id, from_all_courses=True)
         assert exercises[0].get('assessment') is None
         assert exercises[1].get('assessment') == 'Try again'
+
+    @staticmethod
+    def test_get_solution_summary(solution: Solution, staff_user: User):
+        summary = Solution._get_summary(solution)
+        assert summary.get('assessment') is None
+        assert summary['solution_id'] == solution.id
+        assert not summary['is_checked']
+
+        solution.mark_as_checked(staff_user)
+        solution = Solution.get_by_id(solution.id)
+        summary = Solution._get_summary(solution)
+        assert summary['is_checked']