html,
body {
    margin: 0px;
    padding: 0px;
    height: 100%;
    background-color: #202124;
}

#clock-circle {
    stroke-dasharray: 220px;
    stroke-dashoffset: 0px;
    stroke-linecap: round;
    stroke-width: 5px;
    stroke: green;
    fill: none;
    animation: countdown 10s linear infinite forwards;
}

@keyframes countdown {
    from {
        stroke-dashoffset: 0px;
    }
    to {
        stroke-dashoffset: 220px;
    }
}

#timer {
    display: flex;
    color: #fff;
    justify-content: center;
    align-items: center;
    height: 20%;
}

.circle-not-selected:hover {
    stroke-width: 5px;
    stroke: #fff;
}

.circle-selected-correct {
    stroke-width: 5px;
    stroke: #0f0;
}

.circle-selected-wrong {
    stroke-width: 5px;
    stroke: #f00;
}

#play-filed-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60%;
}

#play-field {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 300px;
    width: 300px;
    flex-wrap: wrap;
}

#start-game-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
}

.title {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 30%;
    color: #ffffff;
}

#title-balls {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
    color: red;
}

#button-start {
    background-color: #202124;
    border: 1px solid #ffffff;
    border-radius: 8px;
    box-sizing: border-box;
    color: #0f0;
    cursor: pointer;
    display: inline-block;
    font-size: 16px;
    font-weight: 600;
    line-height: 20px;
    margin: 0;
    outline: none;
    padding: 13px 23px;
    position: relative;
    text-align: center;
    text-decoration: none;
    touch-action: manipulation;
    transition: box-shadow 0.2s, -ms-transform 0.1s, -webkit-transform 0.1s,
        transform 0.1s;
    user-select: none;
    -webkit-user-select: none;
    width: auto;
}

#button-start:active {
    transform: scale(0.96);
}