.article4 {
    position: relative;
    padding-top: 0;
    background-color: var(--main-color);
    margin-top: -1px;
}
.article4::before {
    content: '';
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 40%;
    background-image: linear-gradient(to top, var(--main-color), transparent);
    z-index: 5;
}

.a4-box-wrapper {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 70rem;
    margin-bottom: 100rem;
    z-index: 6;
}

.a4-box {
    display: flex;
    flex-direction: column;
}

.a4-num {
    width: 60px;
    height: 60px;
    color: #fff;
    font-size: 24px;
    font-weight: 300;
    font-family:'Tenor Sans';
    display: flex;
    justify-content: center;
    align-items: center;
    background: url(../images/hex.svg) no-repeat;
    background-size: cover;
    margin-bottom: 10px;
}

.a4-text h6 {
    color: #444;
    padding-bottom: 20rem;
    font-size: 40rem;
    font-weight: 500;
    font-family: 'Tenor Sans';
    border-bottom: 1px solid var(--point-color);
}

.a4-text p {
    color: #444;
    font-size: 22rem;
    line-height: 1.7;
    margin-top: 20rem;
}



/*==================================================*/
@media (max-width: 991px) {
    .a4-box-wrapper {
        padding: 0 5%;
        grid-template-columns: repeat(1, 1fr);
        gap: 150rem;
    }
}


@media (max-width: 550px) {
    .a4-num {
        width: 40px;
        height: 40px;
        font-size: 15px;
    }
    
    .a4-text h6 {
        font-size: 50rem;
    }
    
    .a4-text p {
        font-size: 26rem;
    }
}