html, body {
    color: #1d1d1f;
}

.container {
    max-width: 653px;
}

img {
    max-width: 100%;
}

body {
    min-height: 100vh;
}

a {
    color: inherit;
}

a:hover {
    color: #6c757d;
}

@media only screen and (max-width: 575px) {
    .display-4 {
        font-size: 3rem;
    }
}

.logo {
    width: 2rem;
    height: 2rem;
    background-image: url("/static/images/fav/android-chrome-512x512.png");
    background-color: #1d1d1f;
    background-position: center; 
    background-repeat: no-repeat;
    background-size: cover;
}

.bg-black {
    background-color: #010101;
}

.icon {
    width: 3rem;
}

#main {
    min-height: 80vh;
}

#footer {
    min-height: 20vh;
}

.author_photo {
    width: 2.5rem;
    height: 2.5rem;
    background-color: #010101;
    background-position: center; 
    background-repeat: no-repeat;
    background-size: cover;
}

.article_content > h1 {
    margin-top: 3rem;
}
.article_content > h2 {
    margin-top: 2.5rem;
}
.article_content > h3 {
    margin-top: 1rem;
}


.tool-image {
    position:relative;
    overflow:hidden;
    padding-bottom:100%;
    max-height: 278px;
}
.tool-image img{
      position: absolute;
      max-width: 100%;
      max-height: 100%;
      top: 50%;
      left: 50%;
      transform: translateX(-50%) translateY(-50%);
      filter: grayscale(88%);
}

.shadow-hover:hover {
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.8);
}