.teaching_material_btn_1 {
    color: white;
    transition: transform .1s ease-in-out, filter .1s ease-in-out;
}

.teaching_material_btn_1:hover {
    color: white;
    transform: translateY(-5px) translateX(-5px);
    filter: drop-shadow(5px 5px 0 #aaaaaa);
}

.teaching_material_btn_1 p {
    display: flex;
    width: 50%;
    justify-content: center;
    align-items: center;
    font-family: 華康儷粗宋;
    font-size: 45px;
    font-weight: 200;
    letter-spacing: 4px;
}

.tm-tag {
    width: 135px;
    height: 55px
}

.sentence-copy-btn {
    opacity: 0.25;
    transition: opacity 0.15s ease-in-out;
}

.sentence-copy-btn:hover,
.sentence-copy-btn:focus-visible {
    opacity: 1;
}

@media (max-width: 680px) {
    .bt-style-1 {
        width: 70px;
        height: 45px;
        font-size: 1.2rem;
        padding: 0 7px;
    }

    .tm-tag {
        width: 70px;
        height: 45px
    }
}

@media screen and (max-width: 600px) {
    .teaching_material_btn_1 {
        width: 100%;
    }

    .teaching_material_btn_1 img {
        width: 100%
    }
}

@media screen and (max-width: 470px) {
    .teaching_material_btn_1 p {
        font-size: 36px;
    }
}