body {
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #333;
    height: 100vh;
}

#challenge4 .btn {
    border: 4px solid #fff;
    color: #fff;
    background-color: #333;
    padding: 10px;
    cursor: pointer;
    position: relative;
    font-size: 20px;
    transition: 1.0s
}

#challenge4 .btn::before {
    content: "";
    position: absolute;
    width: 10%;
    background-color: #333;
    top: -8%;
    left: 5%;
    height: 4px;
    transition: 1.0s;
    transform: skew(30deg, 0deg);
}
#challenge4 .btn::after {
    content: "";
    position: absolute;
    width: 10%;
    background-color: #333;
    bottom: -10%;
    right: 5%;
    height: 4px;
    transition: 1.0s;
    transform: skew(30deg, 0deg);
}

#challenge4 .btn:hover{
    background-color: #fff;
    color: #333;
    transform: scale(1.15);
    font-weight: 700;
}

#challenge4 .btn:hover:before {
    left: 85%;
    transform: skew(-30deg, 0deg);
    background-color: #bf0069;
}

#challenge4 .btn:hover:after {
    right: 85%;
    transform: skew(-30deg, 0deg);
    background-color: #bf0069;
}

