body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: -10px;
}
.col {
    flex: 1;
    padding: 10px;
}
@media (max-width: 768px){
    .col{
        flex: 00 50%;
        max-width: 50%;
    }
}
@media (max-width: 480px) {
    .col {
        flex: 0 0 100%;
        max-width: 100%;
    }
}
html {
    font-size: 16px;
}
@media (max-width: 768px){
    html{
        font-size: 14px;
    }
}
@media (max-width: 480px) {
    html {
        font-size: 12px;
    }
}
img {
    max-width: 100%;
    height: auto;
}
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav ul{
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}
nav li {
    margin-left: 20px;
}
@media (max-width: 768px) {
    nav ul{
        display: none;
    }
    nav .menu-toggle{
        display: block;
    }
}