.card {
    position: relative;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0,0,0,.125);
    border-radius: .25rem;
}

.card hr {
    margin-right: 0;
    margin-left: 0;
}

.card-header {
    padding: .75rem 1.25rem;
    margin-bottom: 0;
    background-color: rgba(0,0,0,.03);
    border-bottom: 1px solid rgba(0,0,0,.125);
}

.card-header:first-child {
    border-radius: calc(.25rem - 1px) calc(.25rem - 1px) 0 0;
}

.card-body {
    align-items: normal;
    -webkit-box-flex: 1;
    -ms-flex: 1 1 auto;
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-title {
    margin-bottom: .75rem;
}

.card-header + .list-group .list-group-item:first-child {
    border-top: 0;
}

.card-text:last-child {
    margin-bottom: 0;
}

.card-footer {
    padding: .75rem 1.25rem;
    background-color: rgba(0,0,0,.03);
    border-top: 1px solid rgba(0,0,0,.125);
}

.card-footer:last-child {
    border-radius: 0 0 calc(.25rem - 1px) calc(.25rem - 1px);
}

.card-group {
    display: flex;
    flex-direction: column;
    // The child selector allows nested `.card` within `.card-group`
    // to display properly.
    > .card {
        margin-bottom: 0.9375em;
    }

    @media screen and (min-width: 576px) {
        flex-flow: row wrap;
        // The child selector allows nested `.card` within `.card-group`
        // to display properly.
        > .card {
            flex: 1 0 0%;
            margin-bottom: 0;

            + .card {
                margin-left: 0;
                border-left: 0;
            }

            &:first-child {
                border-right-radius: 0;

                .card-img-top,
                .card-header {
                    border-top-right-radius: 0;
                }

                .card-img-bottom,
                .card-footer {
                    border-bottom-right-radius: 0;
                }
            }

            &:last-child {
                border-left-radius: 0;

                .card-img-top,
                .card-header {
                    border-top-left-radius: 0;
                }

                .card-img-bottom,
                .card-footer {
                    border-bottom-left-radius: 0;
                }
            }

            &:only-child {
                border-radius: .25rem;

                .card-img-top,
                .card-header {
                    border-top-radius: .25rem;
                }

                .card-img-bottom,
                .card-footer {
                    border-radius: .25rem;
                }
            }

            &:not(:first-child):not(:last-child):not(:only-child) {
                border-radius: 0;

                .card-img-top,
                .card-img-bottom,
                .card-header,
                .card-footer {
                    border-radius: 0;
                }
            }
        }
    }
}