add video obj fit set + update readme

public/css/VideoGrid.css

@@ -26,8 +26,8 @@
     display: inline-block;
     background: transparent;
     border-radius: 10px;
-    border: 1px solid rgba(255, 255, 255, 0.2);
-    box-shadow: 0px 12px 22px rgba(0, 0, 0, 0.4);
+    border: var(--border);
+    box-shadow: var(--box-shadow);
     animation: show 0.4s ease;
 }
 
@@ -49,7 +49,7 @@
 .audio {
     position: absolute;
     right: 0;
-    color: white;
+    color: #fff;
     margin: 5px;
     width: auto;
     height: 25px;
@@ -60,7 +60,7 @@
 .username {
     position: absolute;
     bottom: 0;
-    color: white;
+    color: #fff;
     font-size: 14px;
     display: flex;
     align-items: center;
@@ -76,7 +76,7 @@
     position: absolute;
     right: 0;
     bottom: 0px;
-    color: white;
+    color: #fff;
     margin: 5px;
     width: auto;
     height: 25px;
@@ -114,7 +114,7 @@
 .videoMenuBar button {
     float: right;
     margin-right: 3px;
-    color: white;
+    color: #fff;
     background: transparent;
     border-radius: 5px;
     display: inline;
@@ -135,9 +135,8 @@
 video {
     width: 100%;
     height: 100%;
-    object-fit: cover;
+    object-fit: var(--videoObjFit);
     border-radius: 10px;
-    box-shadow: var(--box-shadow);
     cursor: pointer;
 }