spee.ch/client/scss/share-buttons/_share-buttons.scss

.share-buttons {
    display: flex;
    align-items: center;
    margin: 0 -7px;
    a {
        display: block;
        width: 30px;
        height: 30px;
        margin: 0 7px;
        border-radius: 100%;
        line-height: 30px;
        text-align: center;
        &.twitter {
            background:#4DC2FE
        }

        &.facebook {
            background: #5487DE;
            img {
                margin-top: 6px;
            }
        }

        &.tumblr {
            background: #274061;
            img {
                margin-top: 7px;
            }
        }

        &.reddit {
            background: #FF4500;
            img {
                margin-top: 7px;
            }
        }
    }
}