*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html{
    height: 100%;
}

body{
    font-family: monospace;
}
main{
    position: relative;
    min-height: 50vh;
    display:block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    line-height: 4em;
}


.start-btn{
    padding:10px 29px;
    font-size: 16px;
    border-radius: 4px;
    border: none;
    color: white;
    background-color: #008CBA;
    cursor: pointer;
    opacity: 1;
    transition-duration: 0.4s;
    
}

.start-btn:hover{
    background-color: #fff;
    border: 2px solid #008CBA;
    color: #000;

}

.reset-btn{
    padding:10px 20px;
    font-size: 16px;
    border-radius: 4px;
    border: none;
    display: none;
    color: white;
    background-color:#f7022aBA;
    cursor: pointer;
    opacity: 1;
    transition-duration: 0.4s;
}

.reset-btn:hover{
    background-color: #fff;
    border: 2px solid #f7022aBA;
    color: #000;

}

.grid{
    display: none;
    grid-template-columns: auto auto auto;
    background-color: #2196F3;
    margin-top: 10px; 
    width: 400px;
    height: auto;
    padding: 20px; 
    margin: 0 auto;
}

.grid-cell{
    background-color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.8);
    transition-duration: 0.5s;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 50px;
    font-family:cursive;
    text-align: center;
    cursor: pointer;
    opacity: 1.0;
    transition: 0.3s;
    width: 120px;
    height: 120px;
    
}

.grid-cell:hover{
    opacity: 0.8;
}

#player-turn{
    font-size:  18px;
    display: none;
}

#footer{
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 1rem;
    background-color: #efefef;
    text-align: center;
    font-size: 14px;
}

a{
    text-decoration: none;
}
a:visited {
    text-decoration: none;
  }
a:hover {
    text-decoration: underline;
  }
  
  a:active {
    text-decoration: underline;
  }

span{
    font-weight: 600;
}

img{
    width: 20px;
    height: auto;
    
  }