body {
  font-family: 'Arial', sans-serif;
  background-color: #f8f9fa;
}

#container {
  position: relative;
  max-width: 800px;
  margin: 20px auto;
  background-color: #ffffff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
  color: #343a40;
}

.notebook-btn {
  margin-top: 10px;
  padding: 8px 16px;
  cursor: pointer;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
}

.notebooks {
  margin-top: 20px;
  padding: 20px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

h2 {
  position: relative;
  display: inline-block;
  margin-bottom: 10px;
  margin-top: 10px;
  color: #007bff;
}

h2 i {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  margin-left: 10px;
  color: #6c757d;
  cursor: pointer;
}

table {
  width: 100%;
  margin-top: 20px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

th, td {
  border: 1px solid #ddd;
  padding: 12px;
  text-align: left;
}

th {
  background-color: #f2f2f2;
}

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
}

.modal {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  text-align: center;
}

.modal button {
  margin: 0 10px;
  padding: 8px 16px;
  cursor: pointer;
}

#menu {
  margin-top: 20px;
}

#menu a {
  display: inline-block;
  margin-right: 10px;
  cursor: pointer;
  color: #007bff;
  text-decoration: none;
}

.add-word-btn {
  display: inline-block;
  padding: 5px 20px;
  background-color: #4CAF50;
  color: white;
  border: 2px solid #4CAF50;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.add-word-btn:hover {
  background-color: #45a049;
}

#mypageLink{
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 10px 20px;
  background-color: #008CBA;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}
#mypageLink a{
  color: white;
  text-decoration: none;
}

#mypageLink:hover {
  background-color: #005580;
}

#footer {
  text-align: center;
  padding: 10px;
  background-color: #f2f2f2;
}

@media only screen and (max-width:988px){
  #container {
    margin: 20px auto;
    padding: 10px;
  }
  .notebooks {
    margin-top: 10px;
    padding: 10px;
  }
  #mypageLink{
    top: 0px;
    right: 0px;
    padding: 2px 10px;
  }
}