save dialog shader

src/styles/save.less

@@ -13,6 +13,45 @@
   box-sizing: border-box;
 }
 
+@keyframes jump {
+  0% { transform: translate3d(0, 0, 0) scale(0.5); }
+  100% { transform: translate3d(0, -20px, 0) scale(1); }
+}
+
+.save-loader {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: darken(fade(@blue_secondary, 80%), 20%);
+  z-index: 2;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: opacity 250ms;
+  opacity: 0;
+  touch-action: none;
+  pointer-events: none;
+
+  svg {
+    fill: white;
+
+    &:nth-child(2) { animation-delay: 200ms; }
+    &:nth-child(3) { animation-delay: 400ms; }
+  }
+
+  &.active {
+    opacity: 1;
+    touch-action: all;
+    pointer-events: all;
+
+    svg {
+      animation: jump infinite alternate 600ms;
+    }
+  }
+}
+
 .save-description {
   padding: 5px 10px;
 }