Сданный вариант

Friends.html

@@ -12,7 +12,7 @@
             <div class="header">
                 <div class="header-logo">
                     <a href="index.html">
-                        <img src="img/logo2.png" alt="Логотип" width="150" height="150">
+                        <img src="img/logo2.png" alt="Логотип" width="65" height="65">
                     </a>
                 </div>
                 <nav>

Groups.html

@@ -12,7 +12,7 @@
             <div class="header">
                 <div class="header-logo">
                     <a href="index.html">
-                        <img src="img/logo2.png" alt="Логотип" width="150" height="150">
+                        <img src="img/logo2.png" alt="Логотип" width="65" height="65">
                     </a>
                 </div>
                 <nav>

Messages.html

@@ -12,7 +12,7 @@
             <div class="header">
                 <div class="header-logo">
                     <a href="index.html">
-                        <img src="img/logo2.png" alt="Логотип" width="150" height="150">
+                        <img src="img/logo2.png" alt="Логотип" width="65" height="65">
                     </a>
                 </div>
                 <nav>

Profile.html

@@ -12,7 +12,7 @@
             <div class="header">
                 <div class="header-logo">
                     <a href="index.html">
-                        <img src="img/logo2.png" alt="Логотип" width="150" height="150">
+                        <img src="img/logo2.png" alt="Логотип" width="65" height="65">
                     </a>
                 </div>
                 <nav>

index.html

@@ -12,7 +12,7 @@
             <div class="header">
                 <div class="header-logo">
                     <a href="index.html">
-                        <img src="img/logo2.png" alt="Логотип" width="150" height="150">
+                        <img src="img/logo2.png" alt="Логотип" width="65" height="65">
                     </a>
                 </div>
                 <nav>

style.css

@@ -18,14 +18,14 @@ body, html {
     margin: 0;
     padding: 0;
     scroll-behavior: smooth;
-    background-color: с;
+    background-color: #F2EEEE;
     color: #333333;
 }
 
 /* HEADER */
 header {
     background-color: #4169E1;
-    padding: 15px 0;
+    padding: 5px 0;
 }
 
 .header {
@@ -218,7 +218,8 @@ main {
     display: flex;
     gap: 25px;
     margin-bottom: 20px;
-    border-radius: 5%;
+    padding-bottom: 15px;
+    border-bottom: 1px solid #333333;
 }
 
 .message:hover {
@@ -228,6 +229,7 @@ main {
 
 .message:last-child {
     margin-bottom: 0;
+    border-bottom: none;
 }
 
 .message-content span {