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Un código de jrj332790

HTML

CSS

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

* {
    padding: 0;
    margin: 0;
    font-family: "poppins", sans-serif;
    box-sizing: border-box;
    font-weight: 500;
}

body {
    min-height: 100svh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-container {
    position: relative;
    max-width: 350px;
    width: 100%;
    height: 45px;
}

input {
    width: 100%;
    height: 100%;
    outline: none;
    border-radius: .3rem;
    border: 1.5pt solid #ccc;
    padding-left: 16px;
    font-size: 17px;
}

label {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    transition: all 0.2s ease-in-out;
    color: #aaa;
    pointer-events: none;
}

input:focus+label,
input:valid+label {
    left: 14px;
    font-size: 15px;
    top: 0;
    color: #111;
    line-height: 1;
    background-color: #fff;
    padding-inline: 5px;
    font-weight: 600;
}

input:focus,
input:valid {
    border-color: #111;
}