.alert_box {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99;
}

.alert_box .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: rgba(0, 0, 0, 0.7);
}

@keyframes alert_body {
    0% {
        -webkit-transform: translateX(-50%) translateY(0%);
        -moz-transform: translateX(-50%) translateY(0%);
        -ms-transform: translateX(-50%) translateY(0%);
        -o-transform: translateX(-50%) translateY(0%);
        transform: translateX(-50%) translateY(0%);
        opacity: 0;
    }
    100% {
        -webkit-transform: translateX(-50%) translateY(-50%);
        -moz-transform: translateX(-50%) translateY(-50%);
        -ms-transform: translateX(-50%) translateY(-50%);
        -o-transform: translateX(-50%) translateY(-50%);
        transform: translateX(-50%) translateY(-50%);
        opacity: 1;
    }
}

.alert_box .alert_body {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 440px;
    box-sizing: border-box;
    padding: 50px;
    text-align: center;
    z-index: 1;
    -webkit-border-radius: 16px;
    -moz-border-radius: 16px;
    border-radius: 16px;
    background: #FFF;
    -webkit-transform: translateX(-50%) translateY(0%);
    -moz-transform: translateX(-50%) translateY(0%);
    -ms-transform: translateX(-50%) translateY(0%);
    -o-transform: translateX(-50%) translateY(0%);
    transform: translateX(-50%) translateY(0%);
    opacity: 0;
    -o-animation: 1s alert_body forwards;
    -moz-animation: 1s alert_body forwards;
    -webkit-animation: 1s alert_body forwards;
    animation: 1s alert_body forwards;
}

.alert_box .alert_body .alert_head {
    font-weight: 700;
    font-size: 24px;
    padding-bottom: 15px;
}
.alert_box .alert_body .alert_desc {
    padding-bottom: 30px;
}
.alert_box .alert_body .alert_close {
    display: inline-block;
    background: rgb(253, 0, 54);
    line-height: 50px;
    -webkit-border-radius: 30px;
    -moz-border-radius: 30px;
    border-radius: 30px;
    font-size: 16px;
    color: #FFF;
    font-weight: 700;
    width: auto;
    border: 5px #FFF solid;
    -webkit-box-shadow: 0 3px 20px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0 3px 20px rgba(0, 0, 0, 0.2);
    box-shadow: 0 3px 20px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}
.alert_box .alert_body .alert_close span {
    background-image:-webkit-linear-gradient(to top, rgba(0,0,0,0.1), rgba(0,0,0,0.0));
    background-image:-moz-linear-gradient(to top, rgba(0,0,0,0.1), rgba(0,0,0,0.0));
    background-image:-ms-linear-gradient(to top, rgba(0,0,0,0.1), rgba(0,0,0,0.0));
    background-image:-o-linear-gradient(to top, rgba(0,0,0,0.1), rgba(0,0,0,0.0));
    background-image:linear-gradient(to top, rgba(0,0,0,0.1), rgba(0,0,0,0.0));
    display: block;
    line-height: 50px;
    -webkit-border-radius: 25px;
    -moz-border-radius: 25px;
    border-radius: 25px;
    padding: 0 50px;
}