body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #000;
}
.terminal {
    position: relative;
    width: 300px;
    height: 300px;
    overflow: hidden;
}
.terminal:before {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0%;
    height: 120px;
    background: #000;
    z-index: 2;
}
.terminal:after,
h3::after {
    content: '';
    position: absolute;
    right: 0;
    width: 400%;
    height: 100%;
    background: linear-gradient(to right, transparent, #000, #000);
    z-index: 3;
    animation: Roll 8s linear forwards;
}

@keyframes Roll {
    0% {
        right: 0;
    }
    50% {
    	right: -400%;
    }
    100% {
        right: 0;
    }
}

.terminal span {
    position: absolute;
    top: 0;
    width: 20px;
    height: 100%;
    background: #fff;
}

.terminal span:nth-child(1) {
    background: #fffff1;
    left: 0;
}

.terminal span:nth-child(2) {
    background: #fffff1;
    right: 0;
}

.terminal span:nth-child(3) {
    background: #fffff1;
    left: 50%;
    transform: rotate(90deg);
    top: -47%;
    z-index: 1;
}

.terminal span:nth-child(4) {
    background: #fffff1;
    left: 50%;
    transform: rotate(90deg);
    top: 47%;
    z-index: 1;
}

.terminal span:nth-child(5) {
    background: #fff;
    z-index: 3;
    top: 60%;
    left: 20%;
    transform-origin: top left;
    transform: skewX(45deg);
    height: 10%;
}

.terminal span:nth-child(6) {
    background: #fff;
    z-index: 3;
    top: 70%;
    left: 20%;
    transform-origin: bottom left;
    transform: skewX(-45deg);
    height: 10%;
}

.terminal span:nth-child(7) {
    background: #fff;
    z-index: 3;
    top: 75%;
    left: 45%;
    transform: rotate(90deg);
    height: 16%;
    width: 4%;
}

h3 {
    position: relative;
    margin: 0;
    padding: 0;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    color: #fff;
    font-size: 30px;
    text-transform: uppercase;
    letter-spacing: 10px;
    overflow: hidden;
}