@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');
*{
    padding:0;
    margin:0;
    box-sizing: border-box;
}

body{
    background-color: #58CAEA;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    font-family: 'Poppins', sans-serif;;
}

.container{
    background-color: white;
    border-radius: 10px;
    width:300px;
    text-align: center;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.5) ;
}
.header{
    padding:10px;
    font-weight:bold ;
    background-color:#27ae60;
    color:white;
    margin-bottom: 10px;
}
.timer{
    font-size: 30px;
    font-weight:bold;
    margin-bottom: 10px;
}
button{
    padding:10px;
    margin-bottom:10px;
    border-radius:5px;
    border:none;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    width: 70px;
}
#start{
    background-color: blue;
}
#stop{
    background-color: red;
}
#reset{
    background-color: green;
}