* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  box-sizing: border-box;
}

body {
  background: #001e4d;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.container {
  background: #fff;
  width: 100%;
  max-width: 600px;
  margin: 100px auto 0;
  border-radius: 10px;
  padding: 30px;
}

.container h1 {
  color: #001e4d;
  font-weight: 600;
  border-bottom: 1px solid #333;
  padding-bottom: 30px;
  margin-top: 30px;
}

.create {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#amountOfSemesters-El {
  background: rgb(215, 213, 213);
  margin-top: 20px;
  padding: 15px;
  border-radius: 10px;
  font-size: medium;
  flex: 2;
  min-width: 200px;
}

#create-btn {
  background: rgb(53, 95, 146);
  margin-top: 20px;
  padding: 15px;
  border-radius: 10px;
  color: white;
  font-size: medium;
  flex: 1;
  min-width: 120px;
  text-align: center;
}

#create-btn:hover {
  background: darkblue;
  cursor: pointer;
}

.calculate {
  margin-top: 30px;
  border-radius: 10px;
  padding: 10px;
  font-size: medium;
  width: 100%;
}

#submit-btn {
  background: rgb(53, 95, 146);
  margin-top: 20px;
  padding: 10px 20px;
  border-radius: 10px;
  color: white;
  font-size: medium;
  display: none; 
}

#submit-btn:hover {
  background: darkblue;
  cursor: pointer;
}

input::placeholder {
  color: black;
}

ul {
  list-style: none;
}

.container h3 {
  color: #001e4d;
  font-weight: 600;
  padding-top: 30px;
}

@media (max-width: 600px) {
  .create {
    flex-direction: column;
  }

  #amountOfSemesters-El,
  #create-btn {
    width: 100%;
    flex: 1 1 auto;
  }

  .calculate {
    width: 100%;
  }
}