@media screen and (max-width: 420px){
    .action-bar button:nth-child(1){
        width: calc(50% - 0.25rem);
        float: left;
    }
    .action-bar button:nth-child(2){
        width: calc(50% - 0.25rem);
        float: right;
    }
    .action-bar button:nth-child(3){
        width: calc(50% - 0.25rem);
        float: left;
        margin-top: 0.5rem;
    }
    .action-bar button:nth-child(4){
        width: calc(50% - 0.25rem);
        float: right;
        margin-top: 0.5rem;
    }
}

@media screen and (max-width: 420px){
    .action-bar button:nth-child(1){
        width: calc(50% - 0.25rem);
        float: left;
    }
    .action-bar button:nth-child(2){
        width: calc(50% - 0.25rem);
        float: right;
    }
    .action-bar button:nth-child(3){
        width: calc(50% - 0.25rem);
        float: left;
        margin-top: 0.5rem;
    }
    .action-bar button:nth-child(4){
        width: calc(50% - 0.25rem);
        float: right;
        margin-top: 0.5rem;
    }
}