styles.css

@import url('https://fonts.googleapis.com/css2?family=Roboto+Condensed&display=swap');

:root{
    --font: 'Roboto Condensed', sans-serif;
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: var(--font);
    -webkit-tap-highlight-color: transparent;
}

body{
    height: 100vh;
    display: flex;
}

.col{
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    transition: .4s;
}

.col-lock-button, .col-header{
    padding: 10px;
    border-radius: 10px;
}

.col-header{
    transition: background .2s;
    color: white;

}

.col-header:hover, .col-lock-button:hover{
    background: rgba(0, 0, 0, .1);
    cursor: pointer;
}

.col-lock-button{
    transition: .2s;
    border: none;
    background: transparent;
    font-size: 1.5rem;
    color: white
}

.change-button{
    opacity: 0.5;
    border: none;
    display: none;
    box-shadow: 0 0 14px -9px;
}

@media screen and (max-width: 768px) {
    .change-button{
        display: block;
    }

    body{
        display: grid;
        overflow-x: hidden;
    }
}