@media only screen and (max-width : 1749px) {
    .grid-sizer {
        width: 24.3%;
    }
    
    .grid-item {
        width: 24.3%;
    }

    /* about me */

    .ava-intro {
        max-width: 750px;
    }

    .skill-wrapper {
        width: 490px;
    }

    .skill-n {
        width: 90px;
    }
    
    .skill-strip {
        width: 380px;
    }

    .ability-wrapper {
        width: 330px;
    }

    .experience-wrapper {
        width: 490px;
    }

    .contact-wrapper {
        width: 330px;
    }
}

@media only screen and (max-width : 1399px) {
    .grid-sizer {
        width: 32.5%;
    }
    
    .grid-item {
        width: 32.5%;
    }

    /* about me */

    .ava-intro {
        max-width: 500px;
    }

    .skill-wrapper {
        width: 370px;
    }

    .skill-n {
        width: 80px;
    }
    
    .skill-strip {
        width: 270px;
    }

    .ability-wrapper {
        width: 245px;
    }

    .experience-wrapper {
        width: 600px;
    }

    .contact-wrapper {
        width: 245px;
    }
}

@media only screen and (max-width : 1199px) {
    .grid-sizer {
        width: 32.2%;
    }
    
    .grid-item {
        width: 32.2%;
    }

    /* about me */

    .aboutme-h {
        height: auto;
    }

    .avatar {
        width: 250px;
        height: 250px;
        margin-bottom: 3rem;
    }

    .ava-intro {
        max-width: 600px;
    }

    .skill-wrapper {
        width: 600px;
    }

    .skill-n {
        width: 100px;
    }
    
    .skill-strip {
        width: 480px;
    }

    .ability-wrapper {
        width: 500px;
    }

    .experience-wrapper {
        width: 600px;
    }

    .contact-wrapper {
        width: 180px;
    }
}

@media only screen and (max-width : 991px) {
    .grid-sizer {
        width: 49%;
    }
    
    .grid-item {
        width: 49%;
    }

    /* about me */

    .aboutme-h {
        height: auto;
    }

    .avatar {
        width: 250px;
        height: 250px;
        margin-bottom: 3rem;
    }

    .ava-intro {
        margin-left: 0;
        width: 90%;
    }

    .skill-wrapper {
        width: 90%;
    }

    .skill-n {
        width: 20%;
    }
    
    .skill-strip {
        width: 75%;
    }

    .contact-wrapper {
        width: 90%;
    }
}

@media only screen and (max-width : 767px) {
    .sidebar{
        bottom: auto;
        position: fixed;
        padding: 10px 30px 0 30px;
        height: 75px;
        width: 100vw;
    }

    .nav{
        display: flex;
        flex-wrap: wrap;
    }

    .nav-logo{
        width: 35px;
        height: 35px;
        margin: 0;
    }

    .nav-item {
        flex-direction: row;
    }

    .nav-link {
        line-height: 2.3;
        padding: 0 .5rem 0 .5rem;
    }

    .nav-title , .nav-article{
        display: none;
    }
    
    .wrapper {
        margin-left: 0;
        margin-top: 75px;
        width: 100%;
    }

    .vdo {
        height: calc(52vw - 0.7rem);
    }

    .vdoonly {
        height: calc(52vw- 0.1rem);
    }
    
    .vdo43 {
        height: calc(75vw - 3.2rem);
    }
}

@media only screen and (max-width : 575px) {
    .grid-sizer {
        width: 100%;
    }
    
    .grid-item {
        width: 100%;
    }

    .nav-title {
        margin: .3rem 0 0 .8rem;
        display: block;
    }

    .nav-link {
        display: none;
    }

    /* about me */

    .skill-n {
        width: 25%;
    }
    
    .skill-strip {
        width: 68%;
    }
}