added readme improved style of prevew tiles

src/Preview.js

@@ -45,6 +45,9 @@ class Preview extends React.Component {
                          src={this.state.previewpicture}
                          alt='Pic loading.'/>
                 </div>
+                <div className='previewbottom'>
+
+                </div>
             </div>
         );
     }

src/css/Preview.css

@@ -1,9 +1,10 @@
 .previewtitle {
-    height: 10%;
+    height: 20px;
     color: #3d3d3d;
     text-align: center;
     font-weight: bold;
     max-width: 266px;
+    font-size: smaller;
 }
 
 .previewpic {
@@ -12,14 +13,16 @@
 }
 
 .previewimage {
-    max-width: 100%;
-    max-height: 100%;
+    max-height: 400px;
+    min-width: 266px;
+    max-width: 410px;
+}
+
+.previewbottom{
+    height: 20px;
 }
 
 .videopreview {
-    height: 500px;
-    min-width: 266px;
-    max-width: 410px;
     /*width: 250px;*/
     float: left;
     margin-left: 25px;