.stdnCncl { margin-top: 2rem; }
.stdnCncl .box { display: flex; gap: 2rem; border: 1px solid #ccc; padding: 1rem; }
.stdnCncl .box + .box { margin-top: 1rem; }
.stdnCncl .box .img { width: 10rem; }
.stdnCncl .box .img img { max-width: 100%; }
.stdnCncl .box .txt { flex: 1; width: calc(100% - 10rem); padding: 1rem 0; }

@media (max-width: 680px) {
    .stdnCncl .box { flex-direction: column; gap: 1rem; }
    .stdnCncl .box .img { margin: 0 auto; }
    .stdnCncl .box .txt { padding: 0; }
}