ol {
    height: 300px;
    width: 150px;
    overflow-y: scroll;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #00CED1;
    height: 100vh;
}
.watch{
    background-color: #fff;
    padding: 20px;
    width: 500px;
    border-radius: 10px;
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
}
h1 {
    color: #4682B4;
    box-shadow: rgba(0, 0, 0, 0.24) 0px 3px 8px;
    width: 300px;
    text-align : center;
    border-radius: 5px;
    margin-left: 100px;
    height: 100px;
    font-size: 55px;
    padding-top: 30px;
}
button {
    width: 100px;
    height: 50px;
    font-size: 30px;
    border-radius: 5px;
    margin-left: 13px;
    color: #fff;
    background-color: #fff;
    border: 1px solid #fff;
}
.start {
    background-color: red;
}
.stop {
    background-color: #4169E1;
}
.reset {
    background-color : #3CB371;
}
.lap {
    background-color : #FF8C00;
}
li { 
    font-family: bold;
    font-size: 19px;
}