Add styles.css and fix .gitignore

Author: adamnsch

python-wrapper/.gitignore

@@ -5,4 +5,5 @@ build
 # Should we ignore the following?
 src/neo4j_viz/resources/nvl_entrypoint/*
 !src/neo4j_viz/resources/nvl_entrypoint/base.js
+!src/neo4j_viz/resources/nvl_entrypoint/styles.css
 !src/neo4j_viz/resources/nvl_entrypoint/__init__.py

python-wrapper/src/neo4j_viz/resources/nvl_entrypoint/styles.css

@@ -0,0 +1,53 @@
+:root,
+:root.light {
+  --button-hover-bg-color: #f3f3f3;
+  --button-active-bg-color: #d3d3d3;
+  --neutral-text-default: 26 27 29 / 1;
+  --stroke: #4D5157;
+}
+
+:root.dark {
+  --button-hover-bg-color: #5b5b5b;
+  --button-active-bg-color: #8c8c8c;
+  --neutral-text-default: 245 246 246 / 1;
+  --stroke: #d2d2d2;
+}
+
+button.icon {
+  stroke: var(--stroke);
+  background-color: inherit;
+  padding: .4rem .41rem .19rem 0.41rem;
+  border: 1.3px solid #bcbcbc;
+  border-radius: 10px;
+}
+
+button.icon:hover {
+  background-color: var(--button-hover-bg-color)
+}
+
+button.icon:active {
+  background-color: var(--button-active-bg-color)
+}
+
+.tooltip {
+  width: 20%;
+  min-width: 100px;
+  max-width: 600px;
+  max-height: 80%;
+  position: absolute;
+  z-index: 2147483647;
+  right: 0;
+  bottom: 0;
+  background:inherit;
+  border: solid;
+  border-color: #BBBEC3;
+  border-width: 0.5px;
+  padding: 0.8rem;
+  border-radius: 8px;
+  margin-bottom: 1rem;
+  margin-right: 0.5rem;
+  filter: drop-shadow(0 4px 8px rgba(26,27,29,0.12));
+  font-family: PublicSans;
+  color: var(--neutral-text-default);
+  font-size: 14px
+}