Basic working prefab

Packages/com.vrchat.core.vpm-resolver/Editor/Resources/PackageMakerWindowStyle.uss

@@ -0,0 +1,16 @@
+.unity-box {
+    margin: 10px;
+    padding:10px;
+}
+
+.unity-box #description {
+    margin: 10px 0 10px 0;
+    white-space: normal;
+}
+
+#action-button {
+    font-size: 20px;
+    -unity-font-style: bold;
+    padding: 10px;
+    margin:10px;
+}

Packages/com.vrchat.core.vpm-resolver/Editor/Resources/PackageMakerWindowStyle.uss.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 8dfe8fb3b6d0f3e4693553ecc1cb23dd
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 12385, guid: 0000000000000000e000000000000000, type: 0}
+  disableValidation: 0

Packages/com.vrchat.core.vpm-resolver/Editor/Resources/ResolverWindowStyle.uss

@@ -0,0 +1,25 @@
+.unity-box {
+    margin:2px;
+    padding:10px;
+    border-width:0px;
+}
+
+#package-box {
+    margin:2px;
+    padding:10px;
+    border-width:0px;
+    flex-direction:row;
+    max-height:20px;
+    min-height:20px;
+    height:20px;
+    padding-top:0px;
+    padding-bottom:0px;
+    margin-top:0px;
+    margin-bottom:0px;
+    align-items:center;
+}
+
+#manifest-header {
+    font-size: 20px;
+    margin-bottom: 10px;
+}

Packages/com.vrchat.core.vpm-resolver/Editor/Resources/ResolverWindowStyle.uss.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 346f7a547766ecb4396d15f585a15133
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 12385, guid: 0000000000000000e000000000000000, type: 0}
+  disableValidation: 0