Добавил кнопку чтобы скроллить

style.css

@@ -1,29 +1,60 @@
 * {
   margin: 0;
   text-align: center;
+  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+  color: rgb(41, 41, 41)
+}
+
+body {
+  background-color: rgb(241, 241, 241);
 }
 
 #cardholder {
   width: 100%;
+  display: flex;
+  flex-wrap: nowrap;
   overflow-x: auto;
-  white-space: nowrap;
+  scroll-behavior: smooth;
 }
 
 #scroll_btn {
+  background-color: white;
+  margin: auto;
   font-size: xx-large;
   cursor: pointer;
+  border-radius: 50%;
+  width: 1.5em;
+  height: 1.5em;
+  box-shadow: 1px 1px 10px rgba(71, 71, 71, 0.397);
+  -webkit-touch-callout: none;
+  /* iOS Safari */
+  -webkit-user-select: none;
+  /* Safari */
+  -khtml-user-select: none;
+  /* Konqueror HTML */
+  -moz-user-select: none;
+  /* Old versions of Firefox */
+  -ms-user-select: none;
+  /* Internet Explorer/Edge */
+  user-select: none;
 }
 
 .card {
-  display: inline-block;
-  padding: 10px;
-  margin: 10px;
-  border: 1px solid;
-  border-radius: 12px;
+  background-color: white;
+  padding: 1em;
+  margin: 1em;
   width: 400px;
+  flex: 0 0 auto;
+  border-radius: 12px;
+  box-shadow: 1px 1px 10px rgba(71, 71, 71, 0.397);
 }
 
-img {
+.card img {
   max-width: 100%;
   border-radius: 7px;
+}
+
+.card p {
+  width: 90%;
+  margin: 1em auto 0 auto;
 }