html,
body {
    width: 100%;
    margin: 0 auto;
}

.container {
    width: 50%;
    text-align: center;
    margin: 0 auto;
}
.pesan {
    background-color: #fff8c5;
    padding: 10px;
    width: 85%;
    max-width: 600px;
    border: 2px solid #eddb71;
    color: #8c580d;
    text-align: center;
    font-size: 16px;
    font-family: verdana;
    margin: 0 auto;
}

h1 {
    color: red;
    font-size: 24px;
    text-align: center;
    font-family: verdana;
}