more details

src/public/css/offers.css

@@ -82,14 +82,15 @@
 
 #premium-content-area {
   width: 80%;
+  height: 50px;
+  align-items: center;
   margin-left: auto;
   margin-right: auto;
   display: flex;
 }
 
 #premium-selector-area {
-  width: 23%;
-  margin-left: 0;
+  margin-left: auto;
   margin-right: 5%;
   display: flex;
 }
@@ -130,8 +131,19 @@
 
 #premium-price-display-area {
   margin-left: 0;
-  margin-right: 0;
-  width: 70%;
+  margin-right: auto;
+  font-size: 1em;
+  text-align: start;
+}
+
+#premium-price-display-area > * {
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+#market-price-paragraph {
+  color: gray;
+  font-size: 0.8em;
 }
 
 #amount-area-content {
@@ -190,6 +202,10 @@
   width: 2em;
 }
 
+#at-least-one-checkbox {
+  color: red;
+}
+
 #submit-button-area {
   margin-top: 1em;
   margin-bottom: 1em;

src/public/javascript/offers.js

@@ -137,6 +137,7 @@ eurAmountInput.addEventListener('blur', () => {
 
 eurAmountInput.addEventListener('input', () => {
   eurAmountInput.value = eurAmountInput.value.replace(/[^0-9]/g, '');
+  updateBtcInput();
 });
 
 for (const btcMethodCheckbox of btcMethodCheckboxes) {