main.css

:root {
    --dark: #161a1d;
    --light: #f8f9fa;
}

* {
    font-family: 'Helvetica', sans serif;
    box-sizing: border-box;
    color: var(--light);
}

html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow-y: hidden;
}

.container {
    align-items: center;
    background-color: var(--dark);
    cursor: pointer;
    display: grid;
    grid-template-columns: auto auto;
    column-gap: 15px;
    height: 100%;
    justify-content: center;
    width: 100%;
}

#textContainer {
    font-size: 72px;
    font-weight: normal;
}

#toast {
    display: none;
    background-color: white;
    border-radius: 12px;
    bottom: -40px;
    box-shadow: 1px 5px 5px #000;
    color: #222;
    left: 50%;
    padding: 5px 25px;
    position: absolute;
    transform: translateX(-50%);
}

#toast.visible {
    display: block;
    animation-name: appear;
    animation-duration: 0.4s;
    bottom: 20px;
}

#toast.visible.disappearing {
    animation-name: disappear;
    animation-duration: 0.2s;
}

#copyButton {
    background-color: transparent;
    border: 1px solid var(--light);
    color: var(--light);
    padding: 5px 18px;
    border-radius: 10px;
    cursor: pointer;
    transition-property: background-color, color;
    transition-duration: 0.3s;
    font-weight: 700;
}

#copyButton:hover {
    background-color: var(--light);
    color: var(--dark);
}

#copyButton:active {
    opacity: 0.8;
}

@keyframes appear {
    from {
        bottom: 0px;
    }

    to {
        bottom: 20px;
    }
}

@keyframes disappear {
    from {
        display: 20px;
    }

    to {
        bottom: -20px;
        padding: 5px 0;
        font-size: 5px;
    }
}