body {
    font-family: Arial, sans-serif;
    background: #e6f0f5;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
  }

  #vdbanner {
    text-align: center;
    margin: 10px 0;
  }

  .wrapper {
    display: flex;
    max-width: 1550px;
    margin: 0 auto;
    width: 100%;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    transform: translateX(-100%);
    min-height: 100%;
    z-index: 1000;
    background: #2b3a4e;
    color: white;
    width: 200px;
    padding: 20px;
    box-sizing: border-box;
    transition: transform 0.3s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar h2 {
    font-size: 18px;
    margin-bottom: 15px;
  }

  .sidebar ul {
    list-style: none;
    padding: 0;
    margin-top: 50px;
  }

  .sidebar ul li {
    margin-bottom: 10px;
  }

  .sidebar ul li a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 8px;
    border-radius: 6px;
  }

  .sidebar ul li a:hover {
    background-color: #3c506a;
  }

  .main-content {
    flex-grow: 1;
    background: white;
    padding: 20px;
    box-sizing: border-box;
    border-radius: 12px;
    margin: 20px auto;
    margin-top: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    width: 90%;
  }

  h1,h4 {
    text-align: center;
    color: #2b3a4e;
  }

  .hamburger {
    display: flex;
    position: absolute;
    top: 20px;
    left: 20px;
    cursor: pointer;
    z-index: 1001;
    width: 30px;
    height: 25px;
    flex-direction: column;
    justify-content: space-between;
  }

  .hamburger span {
    background: #2b3a4e;
    display: block;
    height: 4px;
    border-radius: 3px;
    width: 100%;
  }
  .hamburger.active span {
    background: #42ffff;
  }
#login_info{
    position: relative;
    top: 50px;
}
.linkbox {
    position: relative;
}
.linkbox a{
    position: absolute;
    top: 0;
    left: 0;
    height:100%;
    width: 100%;
}

.linkbox a:hover {
    opacity: 0.1;
    background-color: #000000;
}

    .base_button {
/*      margin: 0 10px;*/
      padding: 10px 16px;
      font-size: 14px;
      cursor: pointer;
      border: none;
      border-radius: 6px;
      background: #2b3a4e;
      color: white;
    }

    .base_button:hover {
      background-color: #3c506a;
    }

.flex-colmun{
  display: flex;
  flex-direction: column;
}
.bold{
  font-weight: bold;
}
.coler_red{
  color: red;
}