body{
    background:white;
}
.stopwatch{
    width: 90%;
    max-width: 600px;
    background-image: linear-gradient(rgba(0,0,0,0.8),rgba(0,0,0,0.8)),url(images/watch.jpg);
    background-size: cover;
    background-position: center;
    text-align: center;
    padding: 40px 0;
    color: #fff;
    margin: 60px auto 0;
    box-shadow: 0 10px 10px rgba(0,0,0,0.2);
}
.stopwatch h1{
    margin-top: 6px;
    font-size: 64px;
    font-weight: 300;

}
.buttons{
    display: flex;
    align-items: center;
    justify-content: center;
}
.buttons img{
    width: 40px;
    margin: 30px;
    cursor: pointer;
}
.buttons img:nth-child(2){
    width: 100px;
}