:root {
    --border-color: #ddd;
    --bg-color: #1a1a20;
    --fg-color: #fff;
    --counter-bg-color: #223;
    --avatar-border-radius: 50%;
    --title-font-size: 4.5vh;
    --counter-font-size: 8vh;
    --footer-font-size: 2vh;
}

body {
    background-color: var(--bg-color, #1a1a20);
    font-family: Lato, Arial, Helvetica, sans-serif;
    color: var(--fg-color, #fff)
}

.container {
    width: 100%;
    height: 90%;
}

.tabs {
    float: left;
    border: 1px solid var(--border-color, #ddd);
    width: 15%;
    height: 100%;
    border-radius: 15px;
}

.tab-link {
    display: block;
    background-color: inherit;
    color: var(--fg-color, #fff);
    padding: 22px 16px;
    width: 100%;
    border: 1px solid var(--border-color, #ddd);
    outline: none;
    cursor: pointer;
    transition: .3s;
    border-radius: 15px;
}

.tab-link:hover {
    background-color: #222;
    border-radius: 15px;
}

.tabs button.active {
    background-color: #43436f
}

.tab-content {
    float: left;
    padding: 0px 12px;
    border: 1px solid var(--border-color, #ddd);
    border-left: none;
    width: 30%;
    height: 100%;
    border-radius: 15px;
}

.counter-content {
    float: left;
    padding: 0px 4px;
    border: 1px solid var(--border-color, #ddd);
    border-left: none;
    width: 50%;
    height: 100%;
    text-align: center;
    border-radius: 15px;
}

.counter-container {
    padding: 20px 5px;
    width: 98%;
    height: 87%;
    background-color: var(--counter-bg-color, #223);
    border-radius: 15px;
}

.banner {
    width: 100%;
    height: 20%;
    filter: blur(4px);
    border-radius: 15px;
}

.avatar {
    width: 8em;
    height: 8em;
    vertical-align: middle;
    border-radius: var(--avatar-border-radius, 50%);
    border: 2px solid #fff;
    margin-top: -4em;
    position: relative;
}

.counter-title {
    font-size: var(--title-font-size, 4.5vh)
}

.counter {
    font-size: var(--counter-font-size, 8vh)
}

.footer {
    font-size: var(--footer-font-size, 2vh)
}

.option {
    padding: 5px 5px;
    height: 65px;
}

.invalid {
    border: 2px solid red;
    background-color: #ffcccc
}