*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body{
  font-family: Arial, sans-serif;
  background-color: #545353;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

h1{
   color: #ffffff;
   text-align: center;
   padding: 10px;
}

h3{
  margin-top: 10px;
  color: #ffffff;
}

.container{
  border-radius: 10px;
  background-color: #30373f;
  padding: 25px;
}

@media (max-width: 400px){
  .container{
    width: 90%;
  }
}

.input{
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

.input input,
.input select {
  padding: 10px;
  border-radius: 6px;
  background-color: #f1f1f1;
  transition: 0.3s;
  border: none;
  outline: none;
  font-size: 14px;
}

.input input{
  flex: 1;
}

.input select{
  width: 60px;
  text-align: center;
}

button{
  width: 100%;
  height: 40px;
  margin-top: 10px;
  border-radius: 8px;
  border: none;
  background-color: #ffffff;
  font-weight: bold;
}

button:hover{
  color: #ffffff;
  background-color: #0056b3;
  cursor: pointer;
  transition: 400ms;
}

#resultado{
  margin-top: 15px;
  font-weight: bold;
  text-align: center;
  color: #00ff88;
}

#historico{
  list-style: none;
  padding-left: 0;
  max-height: 150px;
  overflow-y: auto;
}

#historico li{
  background-color: #3b444d;
  padding: 8px;
  border-radius: 5px;
  margin-bottom: 5px;
  color: #ffffff;
  font-size: 14px;
}