Design improvements.

src/styles/App.css

@@ -2,6 +2,15 @@
   min-height: 100vh;
   background-color: #1f2c38;
   color: white;
+  display: flex;
+}
+
+.content {
+  width: 100%;
+  padding: 20px;
+  max-width: 1200px;
+  margin-left: auto;
+  margin-right: auto;
 }
 
 .head {
@@ -9,13 +18,12 @@
 }
 
 .search {
-  margin: 20px 20px 0px 20px;
   padding: 10px;
   font-family: 'Font Awesome 5 Free';
   font-size: 1.2rem;
   padding-left: 10px;
   border: none;
-  width: 20%;
+  width: 35%;
   min-width: 300px;
   color: white;
   background-color:#273949;
@@ -29,7 +37,6 @@
 .btn {
   position: relative;
   border-radius: 100%;
-  margin: 20px 20px 0px auto;
   font-family: 'Font Awesome 5 Free';
   width: 40px;
   height: 40px;
@@ -43,6 +50,10 @@
   transition: background-color 0.1s;
 }
 
+.add-btn {
+  margin-left: auto;
+}
+
 .btn:hover {
   background-color: rgb(76, 117, 170);
 }
@@ -56,7 +67,7 @@ textarea:focus, input:focus{
 }
 
 .results {  
-  margin: 20px 20px 0px 30px;
+  margin: 20px 20px 0px 5px;
   display: inline-block;
 }