* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    height: 100vh;
    background-color: #1f1f1f;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.container{
    width: 400px;
    height: fit-content;
}

.text {
    font-size: 2rem;
    color: white;
    font-weight: 600;
}

.text.second {
    color: aqua;
    position: relative;
}

.text.second::after {
    position: absolute;
    content: '';
    width: 100%;
    height: 100%;
    background-color: #1f1f1f;
    left: 0;
    border-left: 2px solid aqua;
    animation: secondtxt 5s steps(18) infinite;
}

@keyframes secondtxt {
    0%{
        left: 0%;
    }
    40%,
    60% {
        left: calc(100% + 4px);
    }
    100%{
        left: 0%;
    }
}