*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #27282c;
}
a{
    position: absolute;
    font-size: 30px;
    font-family: Arial, Helvetica, sans-serif;
    color: #fff;
    background: #444;
    text-decoration: none;
    letter-spacing: 0.05cm;
    transition: 0.5s;
    padding: 10px;
    border: 2px solid #999;
}
a:hover{
    letter-spacing: 0.12cm;
    border: 2px solid rgb(138, 226, 5);
    box-shadow: 0 0 10px greenyellow,
    0 0 20px greenyellow,
    0 0 60px greenyellow,
    0 0 80px greenyellow;
}
a::before{
    content: '';
    position: absolute;
    top: -5px;
    left: 80%;
    border: 2px solid #999;
    width: 10px;
    height: 4px;
    background: #444;
    transition: 0.5s;
}
a::after{
    content: '';
    position: absolute;
    bottom: -5px;
    left: 10%;
    border: 2px solid #999;
    width: 10px;
    height: 4px;
    background: #444;
    transition: 0.5s;
}
a:hover::after{
    width: 15px;
    left: 80%;
    /* bottom: -7px; */
    border: 2px solid rgb(138, 226, 5);
}

a:hover::before{
    width: 15px;
    left: 10%;
    /* top: -7px; */
    border: 2px solid rgb(138, 226, 5);
}