#line-registration {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.line-registration__bg {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 24px;
    box-shadow:
        0 0 8px rgba(128, 128, 128, 0.45),
        0 0 24px rgba(128, 128, 128, 0.35),
        0 8px 28px rgba(128, 128, 128, 0.3);
}

.line-registration__header {
    position: absolute;
    right: 4%;
    bottom: 5%;
    width: 48%;
}

.line-registration__btn {
    display: block;
    width: 100%;
}

.line-registration__note {
    margin: 10px 0 0;
    font-size: 11px;
    line-height: 1.4;
    color: #555;
    text-align: center;
    letter-spacing: 0.02em;
}

.line-registration__btn img {
    display: block;
    width: 100%;
    height: auto;
    filter:
        drop-shadow(0 0 3px #fff) drop-shadow(0 0 10px rgba(255, 255, 255, 0.95)) drop-shadow(0 0 22px rgba(255, 255, 255, 0.7)) drop-shadow(0 6px 14px rgba(255, 255, 255, 0.55));
}