.ubuntu-light {
    font-family: "Ubuntu", sans-serif;
    font-weight: 300;
    font-style: normal;
}
 
.ubuntu-regular {
    font-family: "Ubuntu", sans-serif;
    font-weight: 400;
    font-style: normal;
}
 
.ubuntu-medium {
    font-family: "Ubuntu", sans-serif;
    font-weight: 500;
    font-style: normal;
}
 
.ubuntu-bold {  
    font-family: "Ubuntu", sans-serif;
    font-weight: 700;
    font-style: normal;
}
 
.ubuntu-light-italic {
    font-family: "Ubuntu", sans-serif;
    font-weight: 300;
    font-style: italic;
}
 
.ubuntu-regular-italic {
    font-family: "Ubuntu", sans-serif;
    font-weight: 400;
    font-style: italic;
}
 
.ubuntu-medium-italic {
    font-family: "Ubuntu", sans-serif;
    font-weight: 500;
    font-style: italic;
}
 
.ubuntu-bold-italic {
    font-family: "Ubuntu", sans-serif;
    font-weight: 700;
    font-style: italic;
}
 
body {
    font-family: Ubuntu;
    background-color: #273040;
    color: white;
}
 
h1 {
    font-size: x-large;
    font-weight: bold;
}
 
h2 {
    font-size: xx-large;
}
 
#main-title {
    text-align: center;
}
 
#rules {
    margin-left: 1em;
}
 
#board {
    width: 75vw;
    height: 75vw;
    max-width: 600px;
    max-height: 600px;
    background-color: #e7f0fe;
    margin: auto;
    display: grid;
    /* repeat(7, 1fr) = 1fr 1fr 1fr 1fr 1fr 1fr 1fr */
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(7, 1fr);
}
 
.box {
    width: 100%;
    height: 100%;
    border: 1px black solid;
}
 
.coin {
    width: 80%;
    height: 80%;
    margin: 10%;
    border-radius: 50%;
    border: 5px #273040 solid;
    box-sizing: border-box;
}
 
.red {
    background-color: red;
}
 
.yellow {
    background-color: yellow;
}