.marks {
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    padding-top: 80px;
    padding-bottom: 40px;
}

.marks-grid {
    display: flex;
    grid-gap: 40px;
    flex-wrap: wrap;
    justify-content: center;
    justify-content: space-around
}

.marks-grid li a {
    transition: .3s;
}

.marks-grid li a:hover {
    transform: scale(1.05);
}

.marks-grid li a img{
   min-width: 120px;
   max-width: 140px;
}