.article4 {
    background: url(../images/a4-bg.jpg);
}

.a4-title {
    width: 100%;
    color: rgba(255, 255, 255, .7);
    font-size: 45px;
    font-weight: 700;
    margin-bottom: 3rem;
}

.a4-box-wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.a4-box h5 {
    color: rgba(255, 255, 255, .5);
    font-size: 20px;
    font-weight: 500;
}

.a4-box p {
    color: rgba(255, 255, 255, .3);
    font-size: 16px;
    font-weight: 300;
    line-height: 1.65;
    letter-spacing: 0;
    margin-top: 1rem;
}

.a4-box p b {
    color: rgba(103, 212, 255, 0.3);
    font-weight: 700;
}


/*==================================================*/
@media (max-width: 550px) {
    .a4-title {
        font-size: 32px;
        margin-bottom: 2rem;
    }

    .a4-box-wrapper {
        gap: 1.5rem;
    }
    
    .a4-box h5 {
        font-size: 16px;
    }

    .a4-box p {
        font-size: 12px;
    }
}