diff --git a/vue/src/components/Market.vue b/vue/src/components/Market.vue
index 9a3e877..cc20230 100644
--- a/vue/src/components/Market.vue
+++ b/vue/src/components/Market.vue
@@ -17,8 +17,7 @@
     <label for="stake">how much?</label>
     <input name="stake" v-model="stake" type="number" min="0" placeholder="🗲 sats" />
     <label for="certainty">how sure?</label>
-    <input name="certainty" v-model="certainty" type="number" min="0" max="1" step="0.001"
-      placeholder="fraction like 0.5" />
+    <input name="certainty" v-model="certainty" type="range" min="0" max="1" step="0.001" />
     <label>you receive:</label>
     <label>{{ format(shares) }} {{ selected }} shares @ 🗲{{ format(price) }}</label>
     <label>you pay:</label>