style.css

/*
--building-colour1 is a variable
it can be used at any point in a selector with in it 
means one change will alter all colours with that variable

Best to put variable declarations in the :root as they're accessible everywhere
*/

:root {
    --building-color1: #aa80ff;
    --building-color2: #66cc99;
    --building-color3: #cc6699;
    --building-color4: #538cc6;
    --window-color1: black;
    --window-color2: #8cd9b3;
    --window-color3: #d98cb3;
    --window-color4: #8cb3d9;



}

/*'border-box measures from the edge of the box so madding + border are included in the width*/
* {
    border: 1px solid black;
    box-sizing: border-box;
}

/*'overflow' hides scroll bar when something extends past viewport*/
body {
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

.background-buildings, .foreground-buildings {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    display: flex;
    justify-content: space-evenly;
    align-items: flex-end;
}

/*
common in all building classes so no need to repeat
'flex-direction: colomn;' means items fall underneath eachother
*/
.building-wrap{
    display: flex;
    flex-direction: column;
    align-items: center;
}

/*
common in all window classes so no need to repeat
*/
.window-wrap {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}

/*
Background buildings - 'bb' stand for background building
*/
.bb1 {
    width: 10%;
    height: 70%;
}



/* 
Use of the --building-colour1 variable
*/
.bb1-window {
    height: 10%;
    background: linear-gradient(var(--building-color1), var(--window-color1))

}

.bb1a {
    width: 70%;
}


.bb1b {
    width: 80%;
}

.bb1c {
    width: 90%;
}

/*
Transitions between 1st and 2nd color between 0 and 80% of the element then 3rd color for the rest.
*/
.bb1d {
    width: 100%;
    height: 70%;
    background: linear-gradient(
        purple, 
        var(--building-color1)80%, 
        var(--window-color1));
}

.bb2 {
 width: 10%;
 height: 50%;  
}

.bb2a {
    border-bottom: 5vh solid var(--building-color2);
    border-left: 5vw solid transparent;
    border-right: 5vw solid transparent;
}

.bb2b {
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
      var(--building-color2),
      var(--building-color2) 6%,
      var(--window-color2) 6%,
      var(--window-color2) 9%
    );
}

.bb3 {
    width: 10%;
    height: 55%;   
    background: repeating-linear-gradient(
        90deg,
        var(--building-color3),
        var(--building-color3),
        var(--window-color3)15%

    );
}

.bb4 {
    width: 11%;
    height: 58%;   
}

.bb4-window {
    width: 18%;
    height: 90%;
    background-color: var(--window-color4);
}

.bb4a {
    width: 3%;
    height: 10%;
    background-color: var(--building-color4);

}

.bb4b {
    width: 80%;
    height: 5%;
    background-color: var(--building-color4);

}

.bb4c {
    width: 100%;
    height: 85%;
    background-color: var(--building-color4);

}


/*
Foreground buildings - 'fb' stands for foreground building
*/
.fb1 {
    width: 10%;
    height: 60%;
}


/*
creates triangle
*/
.fb1a {
    border-bottom: 7vh solid var(--building-color4);
    border-right: 2vw solid transparent;
    border-left: 2vw solid transparent;
}

.fb1b {
    width: 60%;
    height: 10%;
    background-color: var(--building-color4);
}

/*
can use multiple gradients of any type by seperating them with ','
*/
.fb1c {
    width: 100%;
    height: 80%;
    background: repeating-linear-gradient(
        90deg,
        var(--building-color4),
        var(--building-color4)10%,
        transparent 10%,
        transparent 15%
    ),
    repeating-linear-gradient(
        var(--building-color4)0%,
        var(--building-color4)10%,
        var(--window-color4)10%,
        var(--window-color4)90%
    );
}

.fb2 {
    width: 10%;
    height: 40%;
}

.fb2-window {
    width: 22%;
    height: 100%;
    background-color: var(--window-color3);
  }

.fb2a {
    width: 100%;
    border-bottom: 10vh solid var(--building-color3);
    border-left: 1vw solid transparent;
    border-right: 1vw solid transparent;
}

.fb2b {
    width: 100%;
    height: 75%;
    background-color: var(--building-color3);
}

.fb3 {
    width: 10%;
    height: 35%;
}

.fb3a {
    width: 80%;
    height: 15%;
    background-color: var(--building-color1);

}

.fb3b {
    width: 100%;
    height: 35%;
    background-color: var(--building-color1);

}

/*
position allows for each item to be moved seperately
*/
.fb4 {
    width: 8%;
    height: 45%;
    background-color: var(--building-color1);
    position: relative;
    left: 10%;
}


.fb5 {
    width: 10%;
    height: 33%;
    background-color: var(--building-color2);
    position: relative;
    right: 10%;
}


.fb6 {
    width: 9%;
    height: 38%;
    background-color: var(--building-color3);
}