there was an error in css, now fixed

css/style.css

@@ -18,14 +18,18 @@ button:hover{
     padding: 2px 5px;
     border-radius:4px;
     mix-blend-mode: multiply;
+    cursor:pointer;
 }
 
 
 /* ///////// class elem ///////////  */
 
-header button{
+header{
-    position:relative;
+    display: flex;
-    top: ;
+    position:absolute;
+    top: 100px;
+    left:300px;
+    space
 }
 .cover, .thesis{
     width: 60%;