Fixed size of model window, and made the background transparent

three_d_viewer/static/three_d_viewer/css/styles.css

@@ -234,7 +234,7 @@ body {
 
 #virtualObject {
 	width: 80%;
-	height: auto;
+	height: 100%;
 	float: right;
 }
 

three_d_viewer/templates/three_d_viewer/mineral_detail.html

@@ -128,7 +128,7 @@ function webGLStart(){
   initShaders();
   initBuffers();
 
-  gl.clearColor(1.0, 1.0, 1.0, 1.0);
+  gl.clearColor(0, 0, 0, 0);
   gl.enable(gl.DEPTH_TEST);
   gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);