index.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f9f9f9;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: bold;
  margin-bottom: 1rem;
}

.nav-admin {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333;
  color: white;
  height: 80px;
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.ggcl {
  font-size: 3rem;
  font-weight: bold;
}

.nav-admin a {
  color: white;
  text-decoration: none;
}

.nav-admin a:hover {
  text-decoration: underline;
}

.table {
  width: 100%;
  margin-bottom: 1rem;
  background-color: #fff;
  color: #333;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.table th,
.table td {
  text-align: left;
  padding: 0.75rem;
  vertical-align: top;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.table thead th {
  vertical-align: bottom;
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
  font-weight: bold;
}

.table tbody+tbody {
  border-top: 2px solid rgba(0, 0, 0, 0.1);
}

.table-sm th,
.table-sm td {
  padding: 0.3rem;
}

.btn {
  display: inline-block;
  font-weight: 400;
  color: #fff;
  text-align: center;
  vertical-align: middle;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  background-color: #333;
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 0.25rem;
  transition: all 0.2s ease-in-out;
}

.btn:hover {
  background-color: #666;
  border-color: #666;
  cursor: pointer;
}

.btn-secondary {
  background-color: #666;
  border-color: #666;
}