* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    background-color: rgb(15, 40, 61);
}
.container {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.welcome_to_homepage {
    color: dodgerblue;
    position: relative;
    transform: translateY(-100px);
}
.welcome_to_homepage span {
    width: 100px;
    height: 100px;
    border: 10px solid dodgerblue;
    display: block;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 60px;
    border: 5px solid transparent;
    border-radius: 50%;
    animation: span_animation 2s linear infinite alternate;
    cursor: pointer;
}

@keyframes span_animation {
    0% {
        border: 5px solid transparent;
        margin-top: 0%;
    }
    100% {
        margin-top: 50px;
        background-color: dodgerblue;
        box-shadow: 1px 1px 2px dodgerblue;
    }
}