body{background:#0f2a47;min-height:100vh;display:grid;place-items:center;font-family:system-ui,sans-serif}
.box{width:min(380px,92vw);background:#f3f5f8;border-radius:14px;padding:1.6rem}
.btn-primary{--bs-btn-bg:#1d4ed8;--bs-btn-border-color:#1d4ed8;--bs-btn-hover-bg:#1e40af;--bs-btn-hover-border-color:#1e40af}