style.css

html,
body {
  padding: o;
  margin: 0;
}
* {
  box-sizing: border-box;
}
body {
  height: 100vh;
  width: 100vw;
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
}
.container {
  height: 100vh;
  width: 50vw;
  background-color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}
.inner {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 92vh;
  width: 43vw;
  background-color: #ba9d71;
}
.outer {
  height: 84vh;
  width: 30vw;
  background-color: #ba9d71;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  row-gap: 1rem;
  box-shadow: 1px 0px 0px 3px white;
}
.title {
  font-size: 3rem;
  color: white;
  font-weight: 600;
}
.number {
  font-size: 10rem;
  font-weight: 600;
  color: green;
}
.low,
#add {
  font-size: 1rem;
  background-color: #0c2b56;
  color: #c3d2dc;
  padding: 12px 10px;
  border-radius: 10%;
  cursor: pointer;
}