style.css

body{ 
    overflow-y: hidden;
    padding: 0px;
    margin: 0px;
}

#avatar{
    display:block;
    border-radius: 50%;
    width: 80%;
    height: auto;
    margin-left:auto;
    margin-right:auto;
}

a{
    text-decoration: none;
}
a:hover{
    text-decoration: none;
}

.nav{
    padding-top: 5px;
    padding-left: 2px;
    padding-right: 5px;
    color: black;
    font-family: monospace;
    text-align: right;   
    background-color: white;
    border-right: 0px solid black;
    line-height: 16px;
}

.content{
    padding: 10px;
    border-left: 1px dashed grey;
    background-color: whitesmoke;
    overflow-y: scroll;
}

.navItem{
    color: black;
    display: block;
}
.navItem:hover{
    color: black;
    text-align: right;
    opacity: 0.5;
    background-color: white;
}

.breakbefore{
    margin-top: 30px;
}


.container {
    display: grid;
    grid-column-gap: 0px;
    grid-row-gap: 0px;
    grid-template-columns: 150px 1fr;
    grid-template-rows: 100vh;
}

#Content-heading{
    font-size: 20px;
    font-weight: bold;
}

.BoxSystem{  
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 300px));
    row-gap: 10px;
    column-gap: 10px;
}

.BoxItem{
    display: block;
    background-color: white;
    margin: 0px;
    padding: 0px;
    height: 200px;
    width: 300;
    border: 1px solid gray;
    transition: transform .2s;
    

}

.BoxItem:hover{
    border: 1px solid black;
    transform: scale(1.01);
}