diff --git a/index.html b/index.html
index ed9c8ce..b9ded37 100644
--- a/index.html
+++ b/index.html
@@ -135,11 +135,11 @@
             </label>
             <label class="grid gap-0-5">
                 Base BTC value ($)
-                <input type="text" name="base" pattern="[\d,]+.?\d" required>
+                <input type="text" name="base" pattern="[\d,]+(.\d+)?" required>
             </label>
             <label class="grid gap-0-5">
                 Base USD rate (₹)
-                <input type="number" inputmode="numeric" name="usd_rate" step="0.01" required>
+                <input type="number" inputmode="numeric" name="usd_rate" min=0 step="0.01" required>
             </label>
             <label class="grid gap-0-5">
                 Guaranteed interest rate (%)