* {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    box-sizing: border-box;
}

.background {
    width: 100%;
    height: 100vh;
    background-image: url("img/main_background.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    opacity: 1;
}

.container {
    height: 100vh;
    padding: 0;
    background-color: white;
    opacity: 0.9;
}

.content {
    opacity: 1;
}

.content h1 {
    text-align: center;
}

.content img {
    max-width: 500px;
    max-height: 500px;
}

footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    text-align: center;
    color: white;
}

.api-btn {
    width: 300px;
}

#cnpm-table {
    display: none;
}

#android-table {
    display: none;
}