main {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 1rem;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    padding: 1rem 0;
    width: 100%;
    max-width: 1200px;
    margin: auto;
}

section[id^="bp-"] {
    -webkit-box-flex: 1;
    -ms-flex: 1 1 300px;
    flex: 1 1 300px;
    max-width: 100%;
}

@media (min-width: 900px) {
    section[id^="bp-"] {
        -webkit-box-flex: 1;
        -ms-flex: 1 1 calc(33.333% - 2rem);
        flex: 1 1 calc(33.333% - 2rem);
        max-width: calc(33.333% - 2rem);
    }
}

@media (min-width: 600px) and (max-width: 899px) {
    section[id^="bp-"] {
        -webkit-box-flex: 1;
        -ms-flex: 1 1 calc(50% - 2rem);
        flex: 1 1 calc(50% - 2rem);
        max-width: calc(50% - 2rem);
    }
}

@media (max-width: 599px) {
    main {
        display: block;
    }

    section[id^="bp-"] {
        max-width: 80vw;
        width: 100%;
        margin: auto;
        padding-left: 1em;
    }
}