tt.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans Korean';
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: 0;
  background-color: #e96d6d27;
}

h1 {
  text-align: center;
  margin-top: 20px;
  color: #333;
}

#userInput {
  width: 80%;
  margin: 10px auto;
  border-collapse: collapse;
  border: 1px solid #d05555;
  background-color: #fffffff0;
}

#userInput th, #userInput td {
  border: 1px solid #e96d6d;
  padding: 8px;
  text-align: center;
}

#userInput th {
  color: #d05555;
  background-color: #e96d6d64;
  font-weight: bold;
}

#userInput input {
  width: 100%;
  padding: 5px;
  margin: 0;
  box-sizing: border-box;
  text-align: center;
  border: none;
  border-radius: 4px;
  background-color: transparent;
  color: #d05555;
}

#userInput input:focus {
  outline: none;
  box-shadow: none;
}

#addRow, #generateTimetable {
  padding: 10px;
  background-color: #e96d6d27;
  color: #e96d6d;
  border: 1px solid #d05555;
  cursor: pointer;
  margin-top: 8px;
  width: 80%;
  box-sizing: border-box;
  border-radius: 50px;
  font-size: 16px;
  font-weight: bold;
}

#addRow:hover, #generateTimetable:hover {
  background-color: #e96d6dd2;
  color: #fff;
}

#timetables {
  width: 80%;
  margin-top: 50px;
  text-align: center;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-evenly;
}

#timetables > div {
  min-width: 30%;
  border: 1px solid #d05555;
  padding: 10px;
  border-radius: 4px;
  background-color: #fffffff0;
}

#timetables h2 {
  margin: 0 0 15px;
  color: #d05555;
}

#timetables p {
  margin: 5px 0;
  color: #d05555;
  font-size: 14px;
}

input:-webkit-autofill {
  -webkit-box-shadow: 0 0 0 100px #fffffff0 inset;
}

#notice {
  border: 1px solid #d05555;
  width: 80%;
  border-radius: 10px;
  margin: 20px;
  padding: 20px;
  font-size: 13px;
  color: #d05555;
  background-color: #fffffff0;
}

#notice p {
  margin-bottom: 10px;
}

#notice p:first-child {
  margin-bottom: 20px;
  font-size: 15px;
  font-weight: 900;
}