.stm_partners_grayscale img {
    filter: grayscale(1);
}

.stm_partners_grayscale .stm_partners__single:hover img {
    filter: grayscale(0);
}

.stm_partners_style_3 {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-pack: justify;
    justify-content: space-between;
    -ms-flex-align: center;
    align-items: center;
}

.stm_partners_style_3 .stm_partners__single {
    opacity: .6;
    transition: .3s ease;
    -ms-flex: 0 1 15%;
    flex: 0 1 15%;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-pack: center;
    justify-content: center;
    -ms-flex-align: center;
    align-items: center;
}

.stm_partners_style_3 .stm_partners__single:last-child {
    -ms-flex-pack: end;
    justify-content: flex-end;
}

.stm_partners_style_3 .stm_partners__single a {
    display: block;
}

.stm_partners_style_3 .stm_partners__single img {
    max-width: 100%;
}

.stm_partners_style_3 .stm_partners__single:hover {
    opacity: 1;
}

@media (max-width: 550px) {
    .stm_partners_style_3 {
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    }

    .stm_partners_style_3 .stm_partners__single {
        -ms-flex: 0 1 100%;
        flex: 0 1 100%;
        margin: 0 0 30px;
    }

    .stm_partners_style_3 .stm_partners__single:last-child {
        -ms-flex-pack: center;
        justify-content: center;
    }
}