.block1-intro .btn{ background:#1b54d5; border-radius:10px; width:303px; height:46px; font-weight:700; font-size:16px; line-height:24px; color:#fff; margin-top:40px;}.block1-intro .btn:hover{ background-color:#002c90;}.d-flex{ display:flex; flex-direction:column; justify-content:center; align-items:center;}