* {
    margin: 0;
    padding: 0;
}

body {
    font-family: sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

h1, h2, h3, p {
  margin-bottom: 10px;
}

a {
    color: #0056b3;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img { width: 100%; }

.btn-group {
  display: flex;
  justify-content: center;
  padding: 0px;
}

.button {
    background-color: blue;
    border: none;
    color: #fff;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    cursor: pointer;
}

.btn-group .button:hover {
  background-color: dodgerblue;
}

.container {
    max-width: 800px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.polaroid {
    width: 80%;
    background-color: grey;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

.upside-down { transform: rotate(180deg); }