body {
    text-align: center;
    font-family: 'Acme', sans-serif;
    margin: auto;
    width: 660px;
    color: #133358;
    background-image: url("../img/bgconnectfour.png");
    background-attachment: fixed;
    background-size: cover;
}

header {
    display: grid;
    grid-template-rows: 1fr 0.5fr;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-areas: "header header header"
                         "player instructions reset";
    align-items: center;
    justify-content: center;
}

.title {
    color: red;
    grid-area: header;
}

.player-turn {
    text-transform: uppercase;
    font-size: 20px;
}

img {
    height: 30px;
    width: 30px;
}

img:hover {
    transition: 0.70s;
    -webkit-transition: 0.70s;
    -moz-transition: 0.70s;
    -ms-transition: 0.70s;
    -o-transition: 0.70s;
    -webkit-transform: rotate(360deg);
    -moz-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    transform: rotate(360deg);
}

table {
    width: 660px;
    background: #133358;
    padding: 30px;
    border-radius: 5%;
    box-shadow: 12px 15px 0px 0 rgba(46, 61, 73, 0.5);
    margin: 0 auto;
}

td {
    height: 80px;
    background-color: white; 
    border-radius: 50%;
}

td.white {
    background-color: white;
}

td.red {
    background-color: red;
}

td.yellow {
    background-color: yellow;
}

#board td:hover {
    background-color: gray; 
}

.modal-background {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba(0,0,0,0.45);
}

.modal-body {
    position: relative;
    width: 300px;
    height: 150px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -70%);
    background: lightsteelblue;
    border-radius: 2%;
    box-shadow: 5px 5px 0px 0 rgba(21, 21, 21, 0.5);
}

button {
    width: 130px;
    height: 40px;
    font-size: 15px;
}

button:hover {
    background-color: gray;
    color: white;
}

.modal-close {
    float: right;
    padding-right: 10px;
}

.modal-title {
    padding-top: 20px;
    text-transform: uppercase
}

.hide {
    display: none;
}

a {
    text-decoration: none;
    color: #133358;
}

#instructions {
    width: 500px;
    text-align: left;
    margin: auto;
    padding-top: 20px;
}

@media screen and (max-width: 660px) {
    body {
        width: 350px;
        background-image: url("../img/bgconnectfour.png");
        background-attachment: relative;
        background-size: contain;
    }
   
    header {
        grid-template-columns: 1fr 1fr 0.5fr;
    }

    table {
        width: 350px;
    }
   
    td {
        width: 40px;
        height: 40px;
    }
   
    #instructions {
        width: 300px;

    }
}