web.css

html{
    
    background-image: linear-gradient( 75deg ,rgba(57,255,243,1), rgba(0,16,171,0.96) )
}
body{
    background-color: #0C1BA4;
    min-height:100%;
    
    background-repeat: no repeat;
    background-size: cover;
    position: relative;
}
#container{
    
    position:absolute;
    top: 10%;
    left: 50%;
}
#box{
        border-radius: 10px;
        width:250px;
        height:300px;
        text-align: center;
        background-color: white;
        box-shadow: black;
        position: relative;
        
}
#boxcontain{
    position: absolute;
    top: 35px;
    left:67px;
    
}
#plus{
    position:relative;
    border-radius: 100px;
    border:1px #0C1BA4;
    width:3px;
    height:3px;
    background-color: #0C1BA4;
    box-sizing: border-box;
    
}
#value{
    font-size: 60px;
    background: linear-gradient(to right,rgba(0,16,171,0.96) 0%, rgba(57,255,243,1) 100%) ;
    -webkit-background-clip: text;
    -webkit-text-fill-color:transparent;
    display: inline-block;
}

button{
    background:none;
    border: 3px solid#0C1BA4;
    border-radius: 100px;
    color:#0C1BA4;
    font-size: medium;
    font-weight: bold;
    box-shadow: #0C1BA4;
    display: block;
    position: left;
}
button::before,
button::after{
    background: #0C1BA4;
    content: "";
    position: absolute;
    z-index: -1;
}
button:hover{
    color:white;
    background-color: #0C1BA4;
}