.list {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.list li {
    width: 50%;
}

.list li:nth-child(even){
    text-align: left;
}

.list li:nth-child(odd){
    text-align: right;
}

@media screen and (max-width: 500px){
    .list li {
        width: 100%;
    }
    .list li:nth-child(even){
        text-align: center;
    }
    .list li:nth-child(odd){
        text-align: center;
    }
}