@media only screen and (orientation: portrait) {
    .nav ul {
        position: fixed;
        flex-direction: column;
        background-color: var(--seccolour);
        text-align: center;
    }
}

:root {
    --colour: skyblue;
    --seccolour: #ffc4d8;
    --defpad: 10px 20px 10px 20px;
}

* {
    margin: 0;
    padding: 0;
}

body {
    background-color: skyblue;
}

.container {
    background-color: var(--seccolour);
}

.nav ul {
    display: flex;
}

ul li {
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background-color: var(--colour);
    margin: 12px 25px 12px 25px;
    padding: var(--defpad);
    list-style: none;
    border: 2px solid black;
    border: hidden;
    border-radius: 25px;
}

ul li:hover {
    --color: rgb(0, 21, 255);
    color: var(--color);
    cursor: pointer;
}