body {
            margin: 0;
            padding: 0;
            text-align: center;
            background-color: #f8f8f8;
        }
        .container {
            max-width: 750px;
            margin: 0 auto;
            position: relative;
        }
.btn-bottom__inner {
    width: 100%;
    margin: 0 auto;
    background-color: #2446cd;
    padding-top: 10px;
    text-align: center;
}
.btn-bottom__inner p, .offer p {
    font-size: 2.0em;
    font-weight: bold;
    color: #ffffff;
}
.btn-bottom__inner .offer {
    max-width: 750px;
    text-align: center;
    margin: 0 auto;
}
input.mail_form {
    width: 80%;
    max-width: 600px;
    height: 3rem;
    font-size: 1.5rem;
    text-align: center;
    border-radius: 10px;
    margin: 5px;
    border: solid 3px #ffffff;
    background-color: #ffffff;
    color: #000000;
}
input.mail_form:focus, 
input.mail_form:active {
    border: solid 3px #ffffff !important;
    outline: none;
}
.offer input.btn {
    animation: scale 1.2s infinite;
    padding: 1rem;
    width: 90%;
    max-width: 600px;
}
.offer input.btn2 {
    padding: 1rem;
    width: 90%;
    max-width: 600px;
}

@keyframes scale {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.95);
    }
}

        img {
            width: 100%;
            height: auto;
            display: block;
        }
        .footer-container {
            background-color: #135da4;
            color: white;
            padding: 20px;
            text-align: center;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 10px;
        }
        .footer-links a {
            color: white;
            text-decoration: none;
        }
        .footer-links a:hover {
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
        }
.fixed_btn {
    display:none;
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) translateY(50px);
    z-index: 800;
    width: 100%;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.fixed_btn img {
    width: 80%;
    max-width:620px;
}

.fixed_btn.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}




        @media screen and (max-width: 768px) {
            .btn-bottom__inner p, .offer p {
                font-size: 1.2em;
            }
            input.mail_form {
                font-size: 1.0rem;
            }
            .footer-links a {
                font-size: 12px;
            }
            .copyright {
                font-size: 10px;
            }
        }