html,
body {
    text-size-adjust: none;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    -ms-text-size-adjust: none;
}

body {
    background-color: white;
    margin: 0;
}

#root {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: darkgray;
}

.container {
    background-color: whitesmoke;
    padding: 2em;
    border-radius: 0.5em;
    width: 500px;
    text-align: center;
    min-width: 300px;
}

.container>h1 {
    color: black;
    margin-bottom: 1em;
    user-select: none;
}

.button {
    background-color: white;
    border-radius: 0.25em;
    border: 1px solid black;
    display: inline-block;
    cursor: pointer;
    color: black;
    font-family: Arial;
    font-weight: bold;
    padding: 0.5em 0.75em;
    width: 80%;
    text-decoration: none;
    vertical-align: middle;
    display: inline-flex;
    text-align: center;
    user-select: none;
    justify-content: center;
}

.button>img {
    width: 1em;
    height: 1em;
    flex-shrink: 0;
    margin-right: 0.5rem;
    top: auto;
}

.button:hover {
    box-shadow: inset 0 0 0 2px #868686, 0 2px 2px 0 rgb(0 0 0 / 8%);
    background: #f0f0f0;
}

.button:active {
    box-shadow: inset 0 0 0 1px #5e5e5e, 0 0 0 1px #fff, 0 0 0 3px #428fdc;
    outline: none;
    background-color: #dbdbdb;
}

@media screen and (max-device-width: 640px) {
    html {
        font-size: 2.5vmax;
        line-height: 1.15;
    }

    .container {
        width: 75%;
    }
}