.sn-developer {
    margin-left: 20px;
}
.sn-developer img {
    height: 20px;
    filter: grayscale(100%);
    transition: filter linear .2s;
}
.sn-developer:hover img {
    filter: grayscale(0);
}

@media (max-width: 600px) {
    .sn-developer {
        margin-left: 0;
        display: inline-block;
        margin-top: 20px;
    }
}

.header .element_years {
    font-size: 24px
}