html, body {
    width: 100%;
    height: 100%;
    margin: 0%;
    font-family: Arial, Helvetica, sans-serif;
}

.grid-container {
    display: grid;
    grid-template-columns: 10vw 10vw 10vw 20vw 50vw;
    grid-template-rows: 20vh 60vh 20vh;
}

.grid-item {
    background-color: white;
    text-align: center;
    padding: 20px;
    font-size: 30px;
}

.item1, .item3, .item4 {
    text-align: left;
    grid-column: 1 / span 4;
}

.item2 {
    grid-column: 5;
    grid-row: 1 / span 3;
    background-color: #c52146;
}

.item1 {
    grid-row: 1;
}

.item3 {
    grid-row: 2;
    margin-left: 12%;
    margin-right: 5vw;
}

.item4 {
    grid-row: 3;
}

#foto-iphone {
    width: 50%;
    height: auto;
}

#logo {
    width: 3vw;
    height: auto;
}

#knop {
    width: 8vw;
}

h1 {
    font-size: 2.5vw;
}

#p1 {
    font-size: 1.5vw;
}

#p2 {
    font-size: 1vw;
    color: grey;
}

@media only screen and (max-width: 430px) {
    .grid-container {
        grid-template-columns: 10vw 80vw 10vw;
        grid-template-rows: 5vh 95vh 30vh 40vh 30vh;
    }

    #logo {
        width: 10vw;
    }
    #knop{
        width: 30vw;
    }
    .item2{
        grid-row: 3 / span 5;
        grid-column: 1 / span 3;
    }
    .item4{
        display: none;
    }
    h1 {
        font-size: 3rem; 
    }
    #p1{
        font-size: 1.6rem;
    }
    #p2{
        font-size: 1rem;
    }
    #foto-iphone{
        grid-column: 2;
        margin-top: 50%;
        width: 70%;
    }
}

@media only screen and (min-width: 431px) and (max-width: 1200px) {
    .grid-container {
        grid-template-columns: 10vw 80vw 10vw;
        grid-template-rows: 5vh 95vh 100vh;
    }

    #logo {
        width: 10vw;
    }
    #knop{
        width: 30vw;
    }
    .item2{
        grid-row: 3 / span 5;
        grid-column: 1 / span 3;
    }
    .item4{
        display: none;
    }
    h1 {
        font-size: 3rem; 
    }
    #p1{
        font-size: 1.6rem;
    }
    #p2{
        font-size: 1rem;
    }
    #foto-iphone{
        grid-column: 2;
        margin-top: 20%;
        width: 50%;
    }
}