Когда поле валидное должен появляться + но он не появляется
<div class="popup-subscribe__box popup-subscribe__box-name">
<label class="popup-subscribe__label" for="popup-subscribe__name">Enter your name</label>
<input class="popup-subscribe__input" id="popup-subscribe__name" type="text" name="Name" placeholder="Anastasiia" required>
</div>
.popup-subscribe__box {
max-width: 460px;
width: 100%;
margin: 0 auto 32px;
position: relative;
}
.popup-subscribe__label {
font-family: "Gotham Pro Regular", sans-serif;
font-style: normal;
font-weight: 400;
font-size: 17px;
line-height: 130%;
color: #171717;
display: inline-block;
margin-bottom: 9px;
}
.popup-subscribe__input {
max-width: 460px;
width: 100%;
background: #F1F4F8;
border-radius: 12px;
-webkit-box-sizing: border-box;
box-sizing: border-box;
padding: 16px 0 16px 24px;
border: 1px solid transparent;
-webkit-transition: all ease-in-out 0.3s;
transition: all ease-in-out 0.3s;
font-family: "Gotham Pro Regular", sans-serif;
font-style: normal;
font-weight: 400;
font-size: 17px;
line-height: 130%;
color: #070033;
}
.popup-subscribe__input::placeholder {
font-family: "Gotham Pro Regular", sans-serif;
font-style: normal;
font-weight: 400;
font-size: 17px;
line-height: 130%;
color: #8F8F8F;
}
.popup-subscribe__input:hover {
border: 1px solid #838099;
}
.popup-subscribe__input:focus {
border: 1px solid #800080;
outline: none;
}
.popup-subscribe__input:valid {
border: 1px solid #1749B3;
}
.popup-subscribe__box::after {
content: "+";
position: absolute;
top: 50px;
right: 17px;
transition: all ease-in 0.3s;
transform: scale(0);
background-color: #1ED760;
}
.popup-subscribe__input:valid.popup-subscribe__box-name::after {
transform: scale(1);
}