*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-direction: column;
    min-width: 100vh;
}

h1{
    margin-top: 20px;
}

.container{
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    flex-flow: row wrap;
    gap: 7px;
    width: 900px;
    height: 550px;
    background-image: linear-gradient(to bottom, hotpink 0% , pink 100%), linear-gradient(to bottom, hotpink 0%, hotpink 100%);
    background-clip: content-box, padding-box;
    margin: 10px 0;
    padding: 20px;
    border-radius: 8px;
}

.item{
    min-width: 70px;
    min-height: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
    border: 2px solid #fff;
    background: powderblue;
    color: #fff;
}

.item1{
    min-width: 100px;
    font-size: 45px;
}

.item2{
    min-height: 40px;
}

.item3{
    min-height: 110px;
    font-size: 25px;
}

.item4{
    min-width: 120px;
    min-height: 80px;
    font-size: 35px;
}

.item5{
    min-height: 55px;
}

.btn1, .btn2, .btn3{
    font-size: 20px;
    margin-top: 10px;
}

button{
  cursor: pointer;
}

.active{
    background: green;
    color: #fff;
}