.nav-bar {
    margin: 0;
    padding: 0;
}

.nav-bar {
    list-style: none;
    display: flex;
}
.navbar-home {
    background-color: rgb(4, 219, 4);
}

li {
    margin: 0 15px;
}

.links {
    text-decoration: none;
}
.links:hover {
    background-color: transparent;
}
.main {
    text-align: center;
    justify-content: center;
}

.join-btn {
    color: white;
    background-color: rgb(4, 219, 4);
    align-items: center;
    text-align: center;
    border: none;
    border-radius: 3px;
    height: 35px;
    width: 100px;
    margin-top: 10px;
}

footer {
    text-align: center;
}

/* for date of birth fields */
.dateofbirth {
    margin-top: 20px;
    width: 79px;
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

/* CSS for input fields */
.input-field {
    margin-top: 20px;
    width: 250px;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }
  
  .input-field::-ms-expand, .dateofbirth::-ms-expand {
    background-color: transparent;
    border: 0;
  }
  
  .input-field:focus, .dateofbirth:focus {
    color: #495057;
    background-color: #fff;
    border-color: rgb(4, 219, 4);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(4, 219, 4, 0.25);
  }
  
  .input-field::-webkit-input-placeholder, .dateofbirth::-webkit-input-placeholder {
    color: #6c757d;
    opacity: 1;
  }
  
  .input-field::-moz-placeholder, .dateofbirth::-moz-placeholder {
    color: #6c757d;
    opacity: 1;
  }
  
  .input-field:-ms-input-placeholder, .dateofbirth:-ms-input-placeholder {
    color: #6c757d;
    opacity: 1;
  }
  
  .input-field::-ms-input-placeholder, .dateofbirth::-ms-input-placeholder {
    color: #6c757d;
    opacity: 1;
  }
  
  .input-field::placeholder, .dateofbirth::placeholder {
    color: #6c757d;
    opacity: 1;
  }
  
  .input-field:disabled, .dateofbirth:disabled, .dateofbirth[readonly], 
  .input-field[readonly] {
    background-color: #e9ecef;
    opacity: 1;
  }
  
/* for button disabled */
#name-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

#dob-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

#contact-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

#edu-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#survey-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}