Add new UI components: Card and Checkbox; enhance Input and Button with additional props

app/styles/_variables.scss

@@ -5,5 +5,6 @@ $color-placeholder-text: rgba(255, 255, 255, 0.44);
 $color-border: rgba(255, 255, 255, 0.16);
 $color-button: rgba(255, 255, 255, 0.08);
 $color-button-hover: rgba(255, 255, 255, 0.16);
+$color-attention: #fc8181;
 
 $standard-border-radius: 0.3rem;

app/styles/global.scss

@@ -3,4 +3,5 @@
 html {
 	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
 		sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+	color: white;
 }