* {
    box-sizing: border-box;
}

h1 {
    font-weight: 400;
    text-align: center;
}

.container {
    width: 100%;
    height: 100vh;
    display: flex;
}

.day {
    margin: auto;
    border: 1px solid #ccc;
    border-radius: 5px;
    background: linear-gradient(rgb(164, 241, 255), #fff);
    padding: 10px;
}

.flex {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

select {
    height: 25px;
    margin-left: 5px;
    margin-right: 5px;
    border-radius: 5px;
}

.days {
    width: 55px;
}

.month {
    width: 100px;
}

.year {
    width: 65px;
}

input[type='button'] {
    display: block;
    background: linear-gradient(#f7f476, rgb(252, 65, 65));
    border: none;
    border-radius: 5px;
    padding: 5px;
    margin: 20px auto;
    cursor: pointer;
}

.container__day,
.container__month,
.container__year {
    display: flex;
    align-items: center;
}

@media (max-width: 375px) {
   h1 {
        font-size: 24px;
    }

    p {
        font-size: 13px;
    }

    .days,
    .month,
    .year {
        font-size: 12px;
    }

    .button {
        font-size: 13px;
    }

    .month {
        width: 70px;
    }

    .days {
        width: 40px;
    }
}