.button-class {
    margin-left: 20px;
    margin-right: auto;
    background-color: #fff;
    border: none;
    padding: 10px 20px;
}

.button-class::before {
    background: transparent;
    border: 2px solid #ff509f;
    border-right: none;
    border-bottom: none;
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 16px;
    width: 24px;
    transition: 1.5s all;
    z-index: 1;
}

.button-class::after {
    background: transparent;
    border: 2px solid #ff509f;
    border-top: none;
    border-left: none;
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    height: 16px;
    width: 24px;
    transition: 1.5s all;
}

.button-class:hover::before {
    height: 100%;
    width: 100%;
}

.button-class:hover::after {
    height: 100%;
    width: 100%;
}