*{
    box-sizing: border-box;
}
body{
    margin: 0;
    width: 100%;
}
h1{
    text-align: center;
}
p{
    text-align: center;
}
#container{
    display: flex;
}
#button{
    position: fixed;
    bottom : 20px;
    left : 625px;
}
@media only screen and (max-width: 650px) {
    *{
        font-size: 80%;
        margin : 0;
    }
    body{
        display: flex;
        flex-direction: column;
        width : 100%;
    }
    h1{
        margin-top: 10px;
        margin-bottom: 0;
    }
    #container{
        display: flex;
        flex-direction: column;
        margin-left: 15%;
    }
    video{
        height: 300px;
        width: 250px;
    }
    img{
        height: 150px;
        width: 250px;
    }
    #button{
        position: absolute;
        top : 300px;
        left: 40%;
        font-size: 50%;
    }
    canvas{
        height: 400px;
        width: 200px;
        margin : 25px 0;
    }
  }