/* the waves decorations */
.deco_waves {
    width: 100%;
    display: flex;
    flex-direction: column;
}

/* let waves have spacing*/
.deco_waves img {
    width: 100vw;
    margin-top: 2%;
}

.footer-back-to-top {
    position: relative;
    width: 100vw;
    display: flex;
    align-items: center;
    flex-direction: column;
    background-color: #e4dfd2;
}

/* icon and title */
.block-title {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.block-title span {
    color: #374a73;
    font-family: "Noto Sans TC", sans-serif;
    font-weight: bold;
    text-align: center;
}

.icon {
    width: auto;
    height: auto;
}

.ch-title {
    margin-top: 0.5vw;
    font-size: 2rem;
    letter-spacing: 0.3125vw;
}

.en-title {
    margin-top: 0.5vw;
    font-size: 1.5rem;
    letter-spacing: 0.078vw;
}

.whitetext-style {
    background-color: #2e4565;
}

.back_to_top .whitetext {
    color: #efeee4;
}

.back_to_top {
    position: relative;
    top: -12.5vw;
    height: 9.5vh;
    border: 0;
    background-color: transparent;
    cursor: pointer;
}

.back_to_top .en-title {
    font-size: 1.041666666vw;
    line-height: 1;
    letter-spacing: 1.5px;
    text-align: left;
}

.back_to_top .icon {
    margin-bottom: 8%;
    width: 40px;
    height: 40px;
    cursor: pointer;
}

@media (max-width: 960px) {
    .back_to_top .en-title {
        font-size: 10px;
    }

    #back_to_top_btn {
        border: 0;
        background-color: transparent;
        cursor: pointer;
    }
}

@media (max-width: 480px) {
    .back_to_top {
        width: 30.5vw;
    }

    .back_to_top .icon {
        width: 30px;
        height: 30px;
    }
}