default

<!DOCTYPE html>
<html lang="es">
<head>
  <style>
    /* Button styles (assuming the button is wrapped in a `.vc_btn3-container` element) */
    .vc_btn3-container {
      display: block;
      margin-bottom: 78px; /* Option 1: Using pixels (less precise) */
      max-width: 100%;
      text-align: center; /* Center alignment for consistency */
    }

    .modern {
      /* Add your desired button styles here (e.g., color, background, padding) */
      color: #fff;
      border-color: #6DAB3C;
      background-color: #6DAB3C;
      font-size: 17px;
      padding: 18px 26px;
      background-image: linear-gradient(to bottom, rgba(255,255,255,.2) 0, rgba(255,255,255,.01) 100%);
      background-repeat: repeat-x;
      filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#33ffffff', endColorstr='#03ffffff', GradientType=0);
      transition: background-color 0.2s ease-in-out; /* Add transition effect */
    }
    .modern:hover { /* Styles applied on hover */
      background-color: #4F8A4F; /* Darken the background color on hover */
    }
  </style>
</head>
<body>
  <div class="vc_btn3-container">
    <a href="https://racingclubferrol.net/wp-content/uploads/2023/12/normas_a_malata.pdf" class="modern">CONDICIONES DE ACCESO Y PERMANENCIA EN A MALTA</a>
  </div>
</body>
</html>


<!DOCTYPE html>
<html lang="es">
<head>
  <title>Página con fondo blanco</title>
  <style>
    body {
      background-color: #fff; /* Establece el color de fondo en blanco */
    }
  </style>
</head>
<body>
  </body>
</html>


<!DOCTYPE html>
<html lang="es">
<head>
  <style>
    /* Button styles (assuming the button is wrapped in a `.vc_btn3-container` element) */
    .vc_btn3-container {
      display: block;
      margin-bottom: 80px;
      max-width: 100%;
      text-align: center; /* Center alignment for consistency */
    }
    .modern {
      /* Add your desired button styles here (e.g., color, background, padding) */
      color: #fff;
      border-color: #6DAB3C;
      background-color: #6DAB3C;
      font-size: 17px;
      padding: 18px 26px;
      background-image: linear-gradient(to bottom, rgba(255,255,255,.2) 0, rgba(255,255,255,.01) 100%);
      background-repeat: repeat-x;
      filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#33ffffff', endColorstr='#03ffffff', GradientType=0);
    }
    .modern:hover { /* Styles applied on hover */
      background-color: #4F8A4F; /* Darken the background color on hover */
    }
  </style>
</head>
<body>
  <div class="vc_btn3-container">
    <a href="https://racingclubferrol.net/wp-content/uploads/2023/12/Acceso-y-permanencia.jpg" class="modern">REGLAMENTO REGULADOR DEL REGIMEN GENERAL DE ACCESO</a>
  </div>
</body>
</html>

Documentación