body {
   font-family: Arial, sans-serif;
   background-color: #f4f4f4;
   margin: 0;
   padding: 0;
}

.container {
   /* width: 90%; */
   /* max-width: 600px; */
   width: 450px;
   margin: 50px auto;
   padding: 20px 35px;
   background: #fff;
   box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
   border-radius: 8px;
}

h1 {
   text-align: center;
   margin-bottom: 20px;
}

#addStudentForm {
   display: flex;
   flex-direction: column;
   /* justify-content: center; */
}

.form-group {
   margin-bottom: 15px;
   display: flex;
   flex-direction: column;
   /* align-items: center; */
   /* justify-content: center; */
}

.form-group label {
   display: block;
   margin-bottom: 5px;
   font-weight: bold;
   font-size: 18px;
}

.form-group input {
   width: 100%;
   padding: 15px 10px;
   border: 1px solid #ddd;
   border-radius: 4px;
   box-sizing: border-box;
   font-size: 15px;
}

button {
   padding: 15px 10px;
   border: none;
   border-radius: 5px;
   background-color: #0051ff;
   color: #fff;
   cursor: pointer;
   font-size: 16px;
}

button:hover {
   background-color: #0033a0;
}

.error {
   color: red;
   font-size: 14px;
   margin-top: 10px;
}