body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    background-color: #222222;
}

h1, h2, h3, h4, h5, h6 {
    color: rgb(0, 0, 0);
    font-weight: 600;
    line-height: 1.3;
}

h2 {
    margin-top:1.3em;
}

a {
    color: #fdfdfd;
    text-decoration: none;
    text-align: center;
}

button.btn.btn-dark {
    margin: 5px;
}

b, strong {
    font-weight: 600;
}

.category {
    display: flex;
    justify-content: center;
    align-items: center;
}
samp {
    display: none;
}

.container h1{
    color: red;
    text-align: center;
    margin-top: 1em;
}


img {
    animation: colorize 2s cubic-bezier(0, 0, .78, .36) 1;
    background: transparent;
    border: 10px solid rgba(0, 0, 0, 0.12);
    border-radius: 4px;
    display: block;
    margin: 1.3em auto;
    max-width: 95%;
}

@keyframes colorize {
    0% {
        -webkit-filter: grayscale(100%);
        filter: grayscale(100%);
    }
    100% {
        -webkit-filter: grayscale(0%);
        filter: grayscale(0%);
    }
}