*, 
*:before, 
*:after{
    box-sizing: border-box;
}
html{
    font-size: 16px;
}
body{
    margin: 0;
    padding:0;
    background-color: papayawhip;
    font-family: 'Roboto', sans-serif;
    text-align: center;
}

body > header {
    width: 100%;
    position: fixed;
    background-color: crimson;
    height: 4.0rem;
}

.header {
    width: 60.0rem;
    display: flex;
    justify-content: space-between;
    /* background-color: blue; */
    margin: 1.0rem auto 0 auto;
    color: white;
}

main {
    padding-top: 5.0rem;
    width: 60.0rem;
    margin: 0 auto;
    background-color: aqua;
}

.portfolio-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.project-card {
    width: 30.0%;
    background-color: chartreuse;
    min-height: 10.0rem;
    margin-bottom: 2.0rem;
}

.project-card img {
    width: 100%;
}

.project-1, .project-2, .project-3  {
    background-color: red;
    height: 60.0rem;
}

.hideAll, .response-container {
    display: none;
}

@media print, screen and (max-width: 40em) {
    /* mobile code */

    .header, main {
        width: 100%;
    }

    .portfolio-container {
        justify-content: center;
        
    }

    .project-card {
        width: 90.0%;
        background-color: rebeccapurple;
    }
}