style.css

@import url("https://fonts.googleapis.com/css2?family=Fugaz+One&display=swap");

:root {
    --white: #EEEEEE;
    --grey1: #222831;
    --grey2: #393E46;
    --red: #EB5353;
    --yellow:#FFD369;
    --green: #36AE7C;
}

html {
    height: 100%;
}

body {
    font-family: 'Bebas Neue', sans-serif;
    background-color: var(--white);
}

.wrapper {
    width: 100%;
    margin: 30px auto;
    color: var(--grey1);
    text-align: center;
}

h1 {
    font-weight: 300;
    font-size: 5em;
    text-transform: uppercase;   
}

p {
    font-size:8em;
    margin: 60px 0px;
    color: var(--grey2);
}

#button-start,
#button-stop, 
#button-reset {
    font-family: 'Fugaz One', sans-serif;
    text-transform: uppercase;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.2em;
    padding: 18px 10px;
    width: 130px;
    margin: 8px;
    border-color: transparent;
    color: var(--grey1);
    box-shadow: 0px 2px 6px var(--grey2);
}

#button-start{
    background: var(--green);  
}

#button-stop{
    background: var(--red);     
}

#button-reset{
    background: var(--yellow);
}

#button-start:active, 
#button-stop:active, 
#button-reset:active {
    transform: translateY(2px);
    box-shadow: var(--white);
}