body.open_popup {
    overflow: hidden;
}

.bg_onetime_popup {
    position: fixed;
    top: 0px;
    left: 0px;
    z-index: 9999;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: 0.5s;
}
body.open_popup .bg_onetime_popup {
    opacity: 1;
    visibility: visible;
}
.onetime_popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    width: 60%;
    background:#0f4983;
    padding:1rem;
}
.onetime_popup_text{color: #FFF;}
.onetime_popup_close {
    margin:10px auto;
}
.onetime_popup_close{
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 175px;
    height: 48px;
    background-color: #fff;
    color: #323030;
    text-decoration: none;
    margin:10px auto;
    cursor: pointer;
}
.onetime_popup_close::before {
    transform: translateX(-50%) translateY(-50%) rotate(45deg);
}
.onetime_popup_close::after {
    transform: translateX(-50%) translateY(-50%) rotate(-45deg);
}
.onetime_popup_content {
    padding: 60px 30px;
    text-align: center;
}

@media screen and (max-width: 600px) {
    .onetime_popup {
        width:100%;
        left:0;
        transform: translateX(0) translateY(-50%);
    }
}