html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
  color: var(--bs-secondary-color);
  text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
  text-align: start;
}
<style >
body {
    background-color: #000; /* black background */
    color: #fff; /* default text white */
}

.list-group-item {
    background-color: #1e1e1e; /* dark grey for the buttons */
    color: #fff; /* white text */
    border: 1px solid #444; /* subtle border to distinguish items */
}

    .list-group-item:hover {
        background-color: #444; /* slightly lighter on hover */
        color: #fff;
        text-decoration: none; /* remove underline on hover */
    }

    .list-group-item:active {
        background-color: #666; /* active click color */
        color: #fff;
    }

</style >