header, 
login,
main,
footer {
    background: linear-gradient(45deg, lightblue 20%, plum 80%);
}

header {
    padding-left: 1%;
}
main {
    padding-left: 1%;
    padding-top: 1%;
}

.btn {
    min-width: 100px;
  font-family: inherit;
  appearance: none;
  border: 0;
  border-radius: 0px;
  background: cornflowerblue;
  color: #fff;
  padding: 8px 16px;
  font-size: 1rem;
  cursor: pointer;
}
.btn-size {
    
}

body {
    font-family: Arial;

    display: grid;
    grid-gap: 5px;
    grid-template-columns: 15% 
                           1fr 
                           15%;
    grid-template-rows: auto
                        50px 
                        1fr 
                        auto;
    grid-template-areas: "header header header"
                         "nav main login"
                         "nav main aside"
                         "footer footer footer";
}

header {grid-area: header;}
nav {grid-area: nav;}
main {grid-area: main;}
login {grid-area: login;}
aside {grid-area: aside;}
footer {grid-area: footer;}


.accordion {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
}

.active, .accordion:hover {
    background-color: #ccc; 
}

.panel {
    padding: 0 18px;
    display: none;
    background-color: white;
    overflow: hidden;
}