body {
    background-color: #111;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft Yahei', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow: hidden;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: linear-gradient(to right, rgba(19, 191, 214, 0.3) 1px, transparent 1px), linear-gradient(to bottom, rgba(19, 191, 214, 0.3) 1px, transparent 1px);
    background-size: 30px 30px;
    background-position: center;
    animation: move 5s linear infinite;
}

@keyframes move {
    from {
        background-position: 0 0;
    }

    to {
        background-position: 60px 60px;
    }
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: auto;
    padding: 30px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

h1 {
    text-align: center;
    font-size: 3em;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

h2 {
    text-align: center;
    font-size: 1.3em;
    margin-bottom: 50px;
    letter-spacing: 0.1em;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    font-size: 1.2em;
    text-align: center;
    border-radius: 25px;
    background-color: #fff;
    color: #000;
    text-decoration: none;
    transition: background-color 0.3s ease-in-out;
    margin-top: 30px;
}

.btn:hover {
    background-color: #000;
    color: #fff;
    cursor: pointer;
}

header,
.content {
    flex: 1;
    height: calc(100vh - 80px);
}

@media screen and (max-width: 767px) {
    h1 {
        font-size: 3em;
    }

    h2 {
        font-size: 1.5em;
    }

    .btn {
        font-size: 1em;
        padding: 10px 20px;
        margin-top: 10px;
    }
}