html, body {
    padding: 0;
    margin: 0;
    background: #000;
}

.world {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: auto;
}

.life {
    width: auto;
    border: 3px solid #999;
    margin: 25px;
}

.population {
    transition: width 400ms ease-out;
    position: absolute;
    top: 0;
    left: 25px;
    width: 100px;
    height: 25px;
    background: #009c58;
}

.alive {
    position: absolute;
    top: 5px;
    left: 35px;
    color: #e5e5e5;
    font-family: sans-serif;
    font-size: 16px;
}

.actions {
    display: inline-block;
    margin: -14px 0 0 15px;
    width: 100%;
}

.title {
    font-family: sans-serif;
    font-size: 26px;
    color: #999;
    margin: 15px;
}

button {
    transition: background 400ms ease-out, border 400ms ease-out, color 400ms ease-out;
    cursor: pointer;
    border: 1px solid #999;
    padding: 15px 35px;
    background: #000;
    color: #999;
    border-radius: 5px;
    font-size: 15px;
    font-family: sans-serif;
    margin-left: 15px;
}

button:focus {
    outline: 0;
}

button:active {
    background: #9c9c9c;
}

button:hover {
    border: 1px solid #fff;
    color: #fff;
    background: #999;
}