styles.css

body {
    font-family: Arial, Helvetica, sans-serif;
}
.container {
    text-align: center;
    margin: auto;
}
canvas {
    background-color: #1e1f26;
    border: 0.75px solid black;
    /* border-left: 0.25px solid #1e1f26;
    border-bottom: 0.25px solid #1e1f26 */
}

table {
    margin: auto;
    margin-top: 20px;
    margin-bottom: 20px;
    border: 1px solid black;
    border-spacing: 0px;
}
tr {
    border: 1px solid black;
}
td {
    border: 1px solid black;
}
.controls {
    text-align: left;
    padding-left: 50px;
}
.controls button {
    margin-top: 10px;
    margin-left: 10px;
    border: none;
    background: none;
    height: 35px;
    border: 1px solid #1e1f26;
    border-radius: 5px;
    padding: 10px;
}

.controls .selector {
    margin-top: 10px;
    margin-left: 10px;
    border: none;
    background: none;
    height: 35px;
    border: 1px solid #1e1f26;
    border-radius: 5px;
    padding: 10px;
    width: 150px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
}

.controls button:hover {
    background: black;
    color: white;
}

a {
    margin-top: 10px;
    margin-left: 10px;

    background: none;

    border: 1px solid #1e1f26;
    padding: 10px;
    border-radius: 5px;
}

.footer {
    display: flex;
    padding-left: 50px;
    padding-right: 50px;
    justify-content: space-between;
    color: white;
    background-color: #1e1f26;
    padding: 20px;
    border-radius: 5px;
}
.footer a {
    border: 1px solid white;
    color: white;
    text-decoration: none;
}

input {
    border: none;
    background: none;
}
input:focus {
    border: none;
    border-radius: 0;
    outline: none;
}

controls .astar:hover {
    background-color: greenyellow;
}