@media screen and (min-width:0px) and (max-width: 768px) {
    .title {
        font-size: 30px;
    }
    /* header */
    .navbar-toggler {
        font-size: 1.5rem;
    }
    .nav-item {
        font-size: 1.5rem;
        padding: 10px;
    }
    /* mainvisual */
    .mainvisual::before {
        display: none;
    }
    .mainvisual a {
        font-size: 15px;
        padding-top: 50px;
    }
    .name p {
        letter-spacing: 6px;
    }
    .name h1 {
        font-size: 30px;
    }
    .mainvisual a span {
        width: 15px;
        height: 15px;
    }
    /* motto */
    .motto {
        background-attachment: scroll;
    }
    .motto h2 {
        font-size: 17px;
        text-align: center !important;
    }
    /* about */
    .about h4 {
        font-size: 25px;
    }
    /* skills */
    .skills {
        background-attachment: scroll;
    }
    .skill-box {
        width: 50%;
    }
    .skill-box img {
        width: 100px;
        height: auto;
    }
    .skill-box h6 {
        font-size: 20px;
    }
    #signlanguage {
        width: 100px;
        height: auto;
    }
    .works-box p {
        font-size: 1rem;
    }
    .works-box a {
        color: #fff;
        font-size: 15px;
    }
    .my-message h1 {
        font-size: 5vw;
    }
    .contact {
        height: 500px;
        padding: 100px 0;
    }
    .contact p {
        font-size: 4vw;
        padding: 10px 10%;
    }
    small {
        font-size: 16px;
    }
    #page-top {
        width: 50px;
        height: 50px;
        line-height: 45px;
        font-size: 30px;
        border-radius: 100%;
        box-shadow: inset 3px 2px 10px rgb(221, 221, 221)
    }
    #page-top:hover {
        display: none;
    }
}