Added some style.css

assets/styles/style.css

@@ -0,0 +1,76 @@
+body {
+    background: linear-gradient(to right, #5CE1E6, #C1FF72, #cb6ce6);
+}
+
+h1 {
+    text-align: center;
+    font-family: "Fredoka", sans-serif;
+    font-optical-sizing: auto;
+    font-style: normal;
+    font-variation-settings: "wdth" 100;
+}
+
+img {
+    width: 60%;
+    height: auto;
+    float: right;
+    margin: 0;
+}
+
+.container {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: auto;
+    margin: auto 0 auto;
+}
+
+form {
+    margin-right: 20px;
+    background: rgba(255, 255, 255, 0.15);
+    border-radius: 16px;
+    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
+    backdrop-filter: blur(8px);
+    -webkit-backdrop-filter: blur(8px);
+    justify-content: center;
+    align-items: center;
+    padding: 50px;
+}
+
+form div {
+    margin-bottom: 10px;
+}
+
+.logo{
+    margin-bottom: 65%;
+    margin-right: 30%;
+}
+
+label {
+    display: block;
+    margin-bottom: 5px;
+    font-family: "Fredoka", sans-serif;
+    font-style: normal;
+}
+
+input[type="text"],
+input[type="password"] {
+    width: 90%;
+    padding: 5px;
+}
+
+button {
+    padding: 10px 20px;
+    background-color: #5CE1E6;
+    color: black;
+    border: none;
+    cursor: pointer;
+}
+
+button:hover {
+    background-color: #CB6CE6;
+}
+
+.submit {
+    margin-left: 15%;
+}

src/Entity/MissionCategory.php

@@ -10,12 +10,10 @@ class MissionCategory
 {
     #[ORM\Id]
     #[ORM\OneToMany(targetEntity: Mission::class, mappedBy: 'MissionCategory')]
-    #[ORM\JoinColumn(nullable: false)]
     private ?Mission $mission = null;
 
     #[ORM\Id]
     #[ORM\OneToMany(targetEntity: Category::class, mappedBy: 'MissionCategory')]
-    #[ORM\JoinColumn(nullable: false)]
     private ?Category $category = null;
 
     public function getMission(): ?Mission