body {
    font-family: "Montserrat", sans-serif
}

body {
    background-image: url("http://kostyq.tech/assets/images/grey-concrete-building-blue-sky.jpg");
    background-position: center center;
    width: 100%;
    background-size: cover;
    background-attachment: fixed;
    background-repeat: no-repeat; 
}
header {
    text-align: right;
    min-height:700px;
}
header h1 {
    color: #FFFFFF;
    font-size: 5em;
    font-weight: 800;
    width:95%;
    font-family: "Kelly Slab", sans-serif;
    padding-top:50px;
    margin-bottom:20px;
}
    
header h2 {    
    color: #330085;
    font-size: 1.2em;
    font-weight: 350;
    width:95%;
    margin:5px;
}

main {
    background-color:#FFFFFF;
    text-align:center;
}

main .portfolio {
    width:80%;
    margin:auto;
    text-align:left;
}

main h3 {
    color: #330085;
    font-size: 3em;
    font-weight: 800;
    font-family: "Kelly Slab", sans-serif;
    padding-top:20px;
}
main h4 {
    font-size: 2em;
    font-weight: 800;
    margin-top:20px;
    margin-bottom:20px;
}

span.clear { clear: left; display: block; }

.card {
    border-radius: 10px;
    background-color:#FFFFFF;
    width:320px;
    float:inline-start;
    margin:20px;
    text-align:center;
    box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.25);
    padding:10px;
    border:1px solid #F0F0F0;
}

.card img {
    width:320px;
}

.container {
    font-size: 1em;
    margin:5px;
}

.top {
    --offset: 40px; 
    position: sticky;
    bottom: 20px;      
    place-self: end;
    margin-top: calc(10vh + var(--offset));
    margin-right:-80%;
}

  
footer {
    clear:both;
    color: #FFFFFF;
    background-color:#000000;
    height: 100px;
    line-height: 100px;
    width: 100%;
    text-align: center;
}