added stylesheet

content/style.css

@@ -0,0 +1,61 @@
+@media only screen and (min-width: 721px) {
+	.container{
+		display: grid;
+		grid-template-columns: repeat(3, 1fr);
+		grid-template-rows: 100px;
+		grid-template-columns: 1fr 1fr 1fr;
+		grid-auto-rows: minmax(100px, auto);
+	}	
+
+	div.item-1 {
+		grid-column: 2 / 3;
+		grid-row: 1;
+	}
+	
+	div.item-2 {
+		grid-column: 2 / 3;
+		grid-row: 2;
+	}
+	
+	div.item-3 {
+		grid-column: 2 / 3;
+		grid-row: 3;
+	}
+}
+
+
+@media only screen and (max-width: 720px) {
+	.container{
+		display: grid;
+		grid-template-columns: repeat(1, 1fr);
+		grid-template-rows: 100px;
+		grid-template-columns: 1fr;
+		grid-auto-rows: minmax(100px, auto);
+	}	
+
+	div.item-1 {
+		grid-column: 1 / 1;
+		grid-row: 1;
+	}
+	
+	div.item-2 {
+		grid-column: 1 / 1;
+		grid-row: 2;
+	}
+	
+	div.item-3 {
+		grid-column: 1 / 1;
+		grid-row: 3;
+	}
+}
+
+div.round-border {
+	border: 1px solid;
+	padding: 0.01em 16px;
+	border-radius: 16px;
+}
+
+.bg {
+ background-color:#feffef;
+ color:#00000;
+}