* {
  margin: 0;
  padding: 0;
  border: none;
  outline: none;
  box-sizing: border-box;
  background-repeat: no-repeat;
  text-decoration: none;
  list-style: none;
  font-family: Georgia, "Times New Roman", Times, serif;
}
body {
  align-content: center;
  height: 95dvh;
  background: #121212;
}
#calc {
  max-width: 500px;
  color: white;
  margin: 20px auto;
  background-color: #1e1e1e;
  border-radius: 12px;
  padding: 20px;
}
#visor {
  display: flex;
  background-color: #000;
  border-bottom: 4px solid #444;
  height: 120px;
  border-radius: 8px;
  padding: 10px;
  text-align: right;
  align-items: center;
}
h1 {
  font-size: 30px;
  color: #0f0;
  overflow-x: auto;
  white-space: nowrap;
  width: 100%;
}

#remover {
  width: 40px;
  height: 100%;
  background-color: #e53935;
  color: white;
  font-weight: bold;
  font-size: 20px;
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color 0.2s;
}
#remover:hover {
  background-color: #ff6f61;
}

ul {
  display: flex;
  flex-wrap: wrap;
  background-color: #333;
  border-radius: 10px;
}
li {
  cursor: pointer;
  border: none;
  font-size: 24px;
  height: 90px;
  width: calc(100% / 3);
  text-align: center;
  align-content: center;
  background-color: #2a2a2a;
  color: white;
  transition: background-color 0.2s, transform 0.1s;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}
li:hover {
  background-color: #555;
  transform: scale(1.02);
}