<style>
* {
    box-sizing: border-box;
}

.row{
    display: flex;
    flex-wrap: nowrap;
}

.column{
    display: flex;
    flex: 50%;
    max-width: 50%;
    padding: 2px;
}

img {
    width: 100%;
    border: 1px;
}

img:hover {
    box-shadow: 0 0 10px 5px rgba(90, 90, 180, 0.5);
}

tr:nth-child(even) {
    background-color: #aaccaa;
}

</style>