.app{
    height: 100vh;
    display: grid;
    grid-template-columns: 1fr 4fr;
    grid-template-rows: 100px 10fr 20px;
    grid-template-areas: 
    'header header'
    'menu mainView'
    'footer footer';                  ;
}
.header{
    background-color: rgb(78, 206, 163);
    color: black;
    height: auto;
    grid-area: header;
    /* justify-content: center; */
}
.header li {
    float: left;
    display: inline;
    list-style-type: none;
}
.header li:hover {
    background-color: #b35959;
  }
.header li input {
    float: right;
}
.menu{
    background-color: grey;
    color: black;
    grid-area: menu;
}
.mainView{
    background-color: rgb(218, 131, 131);
    color: black;
    grid-area: mainView;
}
.footer{
    background-color: black;
    grid-area: footer;
}